This article describes the Wyoming Division HO scale layout built in a 3,750 square foot building with a separate 1,080 square foot shop in Cornville, AZ 17 miles from Sedona. The Wyoming Division models the 485 miles of Union Pacific from Cheyenne to Ogden in HO. It is built on a two level standalone mushroom steel framework bench and has 859 feet of double main line track with a 1957 era, and including the main tracks through staging and the staging helix the length is 1,006 feet.  The layout has over 5,300 feet of track.  The minimum Main line track radius is 36 inches using Atlas Code 83 Flex Track. Peco and Shinohara turnouts and NCE radio control DCC are used.  The first three Figures show the upper and lower deck track plans.   Figure 1.  Upper level track plan There were 10 tunnels on this section of the Union Pacific, and all have been included them by scaling them in length by using an empirical linear equation as a scaling “factor” that makes the longer real tunnels modeled proportionally longer than the model real ones.  The model grades were made proportional to the prototype average grades over selected lengths of track.  Those lengths and grades were taken from a set of 1961 UP Profile Charts. Various locations were picked between which there is a generally uniform up or down slope to the grade, and then the average grade between those two points was calculated.  The prototype has few inundations generally, so this is reasonable to do, and these small changes have little effect on the average grade.  Then the model average grade was set at 1.6 times that of the prototype average over those lengths. The model grade runs from Cheyenne with the reference elevation of zero to +10.66 inches at Sherman.  The model grade is 2.48% which is 1.6x the prototype 1.55%.  This 2.48% requires helpers to take 25 to 30 car trains up the Hill.  The model grade from Ogden up Weber Canyon and Echo Canyon (the Wasatch Mountains) is not so steep (about 1.8% model, 1.14% prototype), again in a ratio of 1.6.  Following prototype practice, helpers are used from Ogden to Green River, Wyoming as well as up Sherman Hill.  UP often cut off the helpers at Wasatch, Utah, but on the model the helpers go on to Green River to use the turntable there to turn them back to Ogden.   Figure 2.  Lower level track plan   Figure 3.  Hidden Track or third level track plan The next photo shows the interior of the building that was built specifically for the Wyoming Division.  The red lines outline the benches of varying widths and 41 inch wide aisles.  The benches range from 24 to 34 inches wide, but Cheyenne (upper level) and Ogden (lower level) are a whopping 84 inches wide.  This 84” width for this one bench was felt necessary to model the entire Cheyenne yard from Tower A through the end of the freight yard.  Cheyenne in the ‘50’s had one of the largest steam facilities in the world, and for historical accuracy it was necessary to model it all.  A picture of that model is shown in Figure 5.  Part of Ogden can be seen on the lower level.   Figure 4.  Empty Building with benches laid out on floor   Figure 5.  Cheyenne Steam Yard from the west on upper level. Ogden is on the lower level. HOW TO OPERATE SUCH A VERY WIDE BENCH The very wide bench shown in Figure 5 is impossible to reach across to throw turnouts with ground throws, so electric switch machines were the required. Lenny Wyatt made the panels shown in Figure 6 with recessed electrical switches to control Tortoise switch machines from an idea that I stole from Rick Fortrin of Northern California.  On AutoCad Lenny drew the panels in UP colors with track diagrams and wired them to the Tortoise machines.  The diagrams have LED lights that show the direction that each turnout is set for at that moment.  The large circles are 1 inch diameter holes to reach in with one finger and operate a rocker switch.  The rocker switches are much like slide switches in that they give an intuitive feeling for the direction the points move.  There are 10 of these panels in Cheyenne from Tower A just outside the photo above in the lower right corner all the way up the photo to Cheyenne Classification around the turn in the bench, but only 9 are in this photo plus one for the turntable.  The 10th is in Figure 4. Lenny made other panels for hard to reach turnouts, three in Ogden and staging, and one each at the Granite quarry, Dale Junction, and at Echo, Utah.   Figure 6.  Panels on Cheyenne Bench from southwest.  North Platte staging is the front 5 stub tracks on the lower level.  They connect to the rest of staging at the lower right. LAYOUT BUILT IN 3 PHASES Figure 7 is a view of about 1/3 of the layout from across Cheyenne.  This photo was taken at the end of Phase II of construction.  We built the layout in 3 phases.  Phase I was most but not all of the benches shown in Figure 7, but it ended at the outskirts of Laramie, which is the white end cap in the center of the picture. In the Phase I we built both helices and the following benches in the following sections.  The photo in Figure 7 is taken looking toward the corner of the building from which the empty building was shot.  Out of view to the left foreground is the Cheyenne steam yard with Ogden out of site on the lower level.  Connected to the steam yard is the Cheyenne freight yard, and staging is on the lower level below that, all out of sight as is the smaller staging helix.  Dale junction is visible at the far right at the end of the bench nearest the wall, and the yellow face of the Dale switch panel for the turnouts can be seen just above the bench.  Laramie is on the upper bench in the center.  The Phase I location of the helix was attached to the end of the bench near the 3 step rolling ladder in the aisle at the right.  Phase I Both the helices plus these benches were built In Phase I (the “/” separates the Upper/Lower levels): the Cheyenne-Classification-Yard/Staging benches were connected permanently by the small helix; Cheyenne-Steam-Yard/Ogden benches was built; Sherman Hill/Echo-Weber Canyon bench was built; The west side of Sherman Hill/Curvo-Echo Canyon bench (Bench 2/3) down to Laramie was built.     Figure 7.  Overall view of the layout Cheyenne to Hanna, Wyoming on the upper level.  Laramie is in the center.  Phase I built up to where the man with the clipboard is walking away on the right. All track was laid and DCC wiring was completed up to this point.  To the open ends of both the upper and lower benches the new main helix was attached.  Thus the helix was where Laramie started (the white end cap was not included).  This made the completed Phase I into a complete loop from staging up the staging helix across Cheyenne, up and back down Sherman Hill to the outskirts of Laramie and down the main helix and back into Utah around the end cap between aisles 1 and 3 (End Cap 1/3) through Echo and into Ogden and back into the Ogden end of staging. Then the “loop” was tested with one or two trains at a time running.  After the DCC was debugged this way, we invited guests for our first informal “operating session” with local guests and some from Flagstaff and Prescott, AZ.  With the larger number of operators we could run many trains at a time, and probably ran 10 or more at some times.  This many trains showed up flaws in the DCC wiring, mainly electrical shorts when a train would cross a power district boundary.  These shorts did not show up without all the other trains running on other parts of the truncated layout.  We fixed those shorts and other defects and had the guests back a month later for another “op session” (really just running a lot of trains at once).  This session revealed one or two more problems, which were soon fixed.  Then we removed the main helix—it had been built with a very sturdy 4 x 4” and 2 x 6” timber frame with heavy duty casters.  To run with it in a place we jacked it up and blocked it sturdily there, leveled it, and attached the two pairs of track (one up and one down) with the DCC wires to the permanent bench tracks. Phase II The Laramie end cap, which has the white painted curved skirt with an open access hatch in it, was built at the beginning of Phase II after the main helix was disconnected, lowered to its casters, and rolled away.  Phase II is also shown in the photo, and it ends abruptly with the main helix attached to it after it was rolled there and jacked up and reattached to the new tracks of Phase II.  Phase II was only two benches and the end cap in the distance connecting them plus the Laramie end cap.  Upon completion it was tested in another informal session of train running with many guests as engineers, all running at once.  Phase III When Phase II was fully tested, Phase III, the rest of the layout was started.  It is shown completed in Figure 8 with the main helix in its final location.  The Cheyenne steam yard is at the far end extending across the back of the picture, and along the right edge of the picture is the Cheyenne Classification Yard with the staging beneath it.  The temporary location of the main helix for Phase II was at the extreme end of the far left bench in the photo.  The main helix in its final location now is in the foreground.  The small temporary Rawlins depot is just this side of the Rawlins coal tower on the left upper bench.  The east end of the large Green River, Wyoming yard is on the lower level visible through the framing of the main helix, and Rock Springs, Wyoming is on the lower level on both sides of the aisle extending straight out from the camera.  The track on the upper level bench in the center is open prairie, the Red Desert area, and on the far end is a siding and spur off it that is Wamsutter, Wyoming.  It is on the east end of a 3 track, center siding (a Harriman Siding).   Figure 8.  Phase III Complete Helix in final location, benches, track work, and DCC done. THE BUILDINGS THAT HOUSEs THE LAYOUT The layout is in a 50 x 75 foot layout building beside a separate 30 x 36 foot shop.  The building is 50 x 75 feet outside dimensions with a 4 in 12 pitched roof above walls that are 12 feet high at the edge of the roof.  Inside the building is a 75 foot long by 7 foot wide viewing mezzanine set on a pair of support beams at each end and suspended in the middle from two oversized girders spaced 25 feet from the each end, and those girders span the 50 foot width of the building.  There are no posts inside the entire interior of the building except for the lower ends of these 2 very large I beams which are about 18 inches wide at shoulder height at 25 and 50 feet along the 75 foot sides.  The headroom under the mezzanine is 8 feet, except on top of the mezzanine there is 6’ 7” of headroom from the 17” riser to the bottom of the mezzanine.  Every other aisle has that 17 inch wooden riser.  There are dual 36 inch wide doors at the front and at the rear of the building. Since Arizona is so hot, geothermal heating and cooling was installed in the building.  Instead of air fan condensing coils outside to convert the gaseous Freon back into a liquid in the heat pump cycle, the geothermal system pumps the gas down into pipes buried in 10 outdoor wells under the parking lot.  Each is about 180 feet deep, and the ground at a constant 72 degree F temperature below about 10 feet depth is the heat sink that makes the phase change back to a liquid very efficient compared to blowing 105 degree F air across coils.  There are two heat pumps hung from those giant beams that support the mezzanine.  The humidity in the layout building is as dry as just about any part of Arizona, so a dehumidifier is not needed.  There is parking on an asphalt lot, and fire sprinklers in both buildings, an approved water well and a septic tank system with adequate grading and fill for the septic drain field.  There is also street parking and a large retention pond on the low southwest corner of the lot for water runoff. The 30 x 36 foot shop building is separate to keep dust from the layout in its own building.  In it is a 10” radial arm saw, a 9” table saw with a 4 x 8 foot top for plywood, a portable table saw, cut off saws for wood and for steel, two drill presses, a 3” modelers’ table saw, a belt sander, a band saw, and other tools, and storage.  It has double 36” personnel doors like the main building, and a 16 foot wide roll up door to handle large items and my pickup truck.  The shop has a swamp cooler that keeps it cool if you have to work out there, but it does get very humid if run a few hours.  CREW LOUNGE In May, 2015 an addition to the shop was started to form a 20 x 30 foot crew lounge for crew meetings, lunch breaks, and lectures.  It has a coffee pot, refrigerator, and tables to eat and write on during slide show presentations.  It will also house the collection of books and photographs of Union Pacific history. LAYOUT CONSTRUCTION DETAILS The buildings were completed in November of 2011, and three of us immediately laid out the pattern of benches on the concrete floor shown in the previous photo.  The aisles are all 41 inches wide, and the spaces between the wider lines are for a standalone mushroom design of benches.  Each of the 3 phases of bench construction involved a new section of benches on which we build spline with cork roadbed after sealing all exposed wood with a light gold prairie dry grass tinted sealer.  We then wired the track for NCE DCC radio operations, and we tested the track and wiring before we continued bench building.  The benches are very sturdy and have steel frameworks made from 1½” square steel tubing welded to form uprights to hold a flat surface for each of the two mushroom levels.  The next photo in Figure 9 shows a typical bench end on, Figure 9.  End view of benches in construction. and this happens to be the two new benches of Phase II, which were not yet joined by an end cap.   The square tube steel legs are in an “F” shape with a second leg from the lower horizontal piece for the lower deck down to the floor.  This can be seen clearly in the design drawing of Figure 10.  The steel has been painted with the same light yellow sealer that is used to seal the wood, but the open end of one of the 1½” square tubes can be seen on the left hand member.  Of the two benches under construction in the foreground, the aisle between them will eventually have a riser for operators to stand on to reach the top level on either side of the aisle.  The other two aisles, to the far right and far left will have no risers, so the lower level benches are worked from the concrete floor.  This is the standalone mushroom design.  Eventually, both the riser and the concrete aisles will be carpeted.            Figure 10.  Design of the “F” framed benches The backs of these two incomplete benches in the photo will have a sheet of ½” plywood screwed to it on the long leg of the “F” with self-tapping screws.  Those sheets are not on these benches yet.  This full 4 x 8foot vertical sheet of plywood forms a shear panel to keep the leg pairs from tilting together from a rectangular to a parallelogram shape.  The top sheet of ½” plywood serves the same anti-shear purpose in the horizontal plane. Track is not laid on the flat plywood surfaces except for yards.  Spline roadbed with cork on it is blocked up to the proper elevation to model the prototype grades.  If a yard is at an elevated level above the bench top we use a separate sheet of plywood for it.  The top plywood sheet of the bench is there for structural strength, and it also keeps an expensive locomotive from crashing all the way to the concrete floor should disaster strike. This a “standalone mushroom” design, because there are no benches attached to or supported by walls.  This has four disadvantages and two very big advantages.  First, not using the walls to support benches puts a premium on bench stability, hence the ½” plywood sides for shear panels like on a two story house wall.  The top of each bench is also a sheet of ½” plywood screwed to the steel, and it is a shear panel as well.  Together the two sheets of plywood keep the legs from twisting in any direction.  The track elevation is controlled by blocking the spline roadbed up to the desired height above the bench, and the total block height is adjusted by screws through two blocks, so the blocks do not have to be cut to an exact length. The second disadvantage to a mushroom design is that it takes a lot more floor space than if benches were attached to walls.  There are benches even up against the walls in most non-mushroom designs. The two chief advantages to the mushroom design is that with a mushroom design, every other aisle is for operations only on the upper level and the alternate aisles are used exclusively for the lower level.  This means that with appropriate backdrops, which do not have to be overly tall, operators on different levels cannot see each other.  Indeed, each can see only forward or back on his own track, not onto another level, so the effect is like being out in the country where the tracks before you and those left or right are all that are visible.  The second advantage is even more important.  Since all operators in any aisle are working the same level, there is little possibility of interference between them, and there is no need to stagger upper level and lower level yards.  I believe that these two mushroom advantages, if you have the room for it, outweigh the first two disadvantages and also the next two. The third disadvantage is that the extra lumber required to build the riser is not a trivial expense either in time or money.  And I have yet to see a discussion of the end of the riser in any book on mushrooms.  There has to be a way up to the riser, be it steps or a ramp.  Either takes a lot of lateral room, so an operator has a chance to see steps or the ramp ahead of him, so he can account for it as he walks so as not to stumble.  This extra space requirement may be hard to accommodate except for a very large layout. Finally, a mushroom requires a very high ceiling.  The Wyoming division uses 17” risers, so that inside a standard 8 foot ceiling, which is usually about 94,” the head room is only about 69.”  In my case I tried to get away with 10 foot outside walls in my design, and then 11, but had to settle on 12 foot walls to get a reasonable balance of head room under and over the mezzanine.   The extra building height played out as extra expense in the heavier steel to meet wind shear code requirements. OTHER BENCH FEATURES AND DCC WIRING The photo in Figure 11 below shows completed bench at the far left with spline and cork and track in place, and there is also a long thin door open on the lower level fascia.  This is a wire chase that runs all around the layout for most of the DCC protection circuit breakers.  The chases generally have a 5 ½” square cross section.  Not all the wiring goes in the chases, but we try to put anything that would  Figure 11.  Wire chase with hinged door at front of lower level bench.  F steel legs also seen. need access, even wiring, and in particular it is used for all of the DCC block occasional access, in a chase where it is out of sight, but on the bench front to be easily accessible.  This includes DCC circuit breakers and bus bars in pairs (in lieu of terminal strips) to connect power districts to the wiring mains.  The 10 AWG DCC main power buses and the 18 AWG feeders up to the tracks (and where used any 14 AWG sub power buses) are generally not in the chases, but we solder all connections, so with good soldering techniques they are fool proof, so accessibility is not important.   I do not solder the 18 AWG feeders to the track rails.  I spot weld them with a jewelers’ spot welder, so heating of plastic ties is impossible and no solder blobs are seen.  The spot welds of the copper wire to the nickel silver rails are very strong and reliable and the weld bead is small.  Wire chases are built into the upper level also, and this is shown in the Figure 11.  There the backdrop of the lower level is curved out to near the center of the underside of the upper level bench.  Doors on the far side, the back of the lower level but the front of the upper level, open just below the upper level bench for the wire chase.  Figure 12.  Lower level bench details for wire chase at Echo, Utah.  Also seen are one of the 4 very large steel posts that support the roof and from which the mezzanine hangs. The curved backdrop here at Echo, Utah forms the back of the inside of the wire chase.  The door behind the curved backdrop is open and can be seen hanging on its hinges behind the curve.  Both the upper level wire chase (behind the curved backdrop) and the lower level wire chase under the front of the lower level bench all have doors from which many critical non- soldered items are attached on the insides, out of the way but easily accessible. Instead of terminal strips, brass bus bars imported from China are used in pairs and are also usually mounted inside the wire chases or occasionally on the bottom of the upper level bench.  The bus bars used are a heavy brass bar with 8 large tapped holes with screws down into wire holes sufficient for a #10 AWG wire, and the brass is mounted on a pair of nylon standoffs.  I use the bus bars in pairs to make a terminal strip.  Terminal strips are commonly used for DCC to separate wiring between power districts and between breaker districts to facilitate disconnecting a given section of the layout from the rest to isolate shorts.  The bus bars in pairs are simpler, because no jumpers are required as for terminal strips, and they are much cheaper.  The Wyoming Division imported 4,000 of them from China, and most of the leftovers are now available from a Phoenix Hobby Shop that supplies all of our model railroad equipment and supplies, “An Affair With Trains,” Also just visible in many photos are some of the 24” single T8 florescent tube fixtures placed on the underside of the top level benches to light the lower level.  The fixtures are placed end to end, and with the average lower level “shelf height” of about 18 inches, the lighting is bright and uniform. The Wyoming Division imported 1,000 24” long T8 florescent fixtures and 4,000 each of the 8 screw bus bars at a small fraction of the unit cost from local big box stores, which import them from China just like we did.  They are steel with a built in terminal strip for wiring and are less expensive than Home Depot or WalMart at HELICES The layout has two helices that connect the two ends of the two levels of benches.  The smaller is to connect the ends of the layout (Cheyenne and Ogden) to the staging.  East Cheyenne is shown with the Frontier Refinery on the upper level at the staging helix that connects to staging on the lower level as seen in Figure 13.  The other end of staging, not shown, connects to the west end of Ogden, so the point to point layout is made into a circle with the staging serving both ends of the layout.   Figure  13.  Staging helix connecting east Cheyenne on the upper level to staging on the lower level.  Frontier oil is on the upper level.   The main helix is shown with the smaller staging helix in the next photo.  It connects the upper and lower benches together in the middle of the layout, about one half of the way from Cheyenne to Ogden on the layout.  When this photo was taken the upper level had not been connected to the helix tracks, but the next level, the lower level had. A third level can be seen.  Technically this third level is hidden track from a junction at the elevation of the lower bench tracks about 3 benches away from this view.  From that junction that hidden track drops in elevation under the lower level to end in the auxiliary staging yard just visible in the photo.  This yard is “Portland, Oregon,” and the hidden track is the Oregon Short Line (OSL) that leaves the UP main at Granger, Wyoming.    Figure 14.  Across the aisle from the Staging Helix is the Main Helix.  Each helix connects ½ of the upper level of the benches to ½ of the lower level. The Staging Helix has 3 ¾ turns of double track on a minimum 36 inch radius, and is oval in shape with 36 inch straight sides.  The maximum grade is 1.45%.  There are also two turning loops on it, one for each bench level to turn passenger trains in staging so that for their next run they are pointing in the opposite direction than when they left the layout to the loop.  An east bound train through Cheyenne to “Chicago” traverses the loop and returns with its locos pointed west.  The upper loop can be seen as the inner turn of three tracks.  The lower level loop is the outer loop of three, and it does the same function for west bound trains through Ogden to “LA” or the “Oakland.”  The double track Main Helix is similar with 2 ¾ turns, a minimum 36 inch radius, and is oval in shape but with 84 inch straight sides which gives a maximum grade of 1.68%.  Together with the Staging Helix the Main Helix connected to each end of the two layout levels make a continuous loop, although we always run point to point. To save plywood the roadbed shelves were cut from 11 inch wide strips of ½” plywood and reinforced with wood cleats or steel angle.  The sections were glued with reinforcing blocks glued and screwed between the edges of each pair.  Sections of assemblies of each turn were attached together with all 3/8” all thread rod bought in 8 foot lengths in the electrical department of Home Depot (more expensive/foot and wasteful 36 inch lengths are in the rod material boxes in the hardware HD departments). The threaded rods allow easy, if tedious vertical movement of each section of helix turn to make a smooth roadbed.  Each time we rolled the helix to a new location, we adjusted it to eliminate bumps in the sections. THE REST OF THE LAYOUT The next photo shows the east end of the large Green River, Wyoming yard on the lower level (through the Helix superstructure.  In Figure 15, the turntable, roundhouse, and the Green River will be at the far end of the right hand bench.   Figure 15. The other half of the layout from the mezzanine.   Figure 16.  The rest of Green River yard looking west. Green River is one of the 4 major yards on the layout (including Cheyenne, Laramie, and Ogden/staging).  Here engine changes are made for most trains, and helpers are cut off for east bound trains having completed the climb up the Wasatch Mountains from Ogden.  Blocks are also switched on west bound trains for either California (we call those destinations LA or Oakland) or Portland up the OSL which junctions off the main at Granger just out of the photo on the next bench left (31 miles on the prototype). From Granger the mains go into the very long Aspen and Altamont tunnels, over a train length on the layout and 5,941 and 6,706 feet long respectively on the UP, and they come out into Evanston, Wyoming and from there into Utah.  A few miles inside Utah at a place named Curvo are tunnels 5 and 6 on both the prototype and the layout.  These are tunnels bored years apart and very near each other but at different elevations.  Just to the west of the tunnels the west bound main crosses over the east bound main on a steel overpass.  From there into Ogden the layout, always following prototype practice, runs on the left  hand track to take advantage of the newer, gentler grade from Ogden to the Wasatch summit between Curvo and Evanston (Wasatch, Utah). The tracks continue with left hand running through Echo out of Echo Canyon and make a 90 degree turn 9on the prototype) to continue down the Weber River Canyon into Ogden.  This sharp right turn is approximated by using the end cap of two benches, so the model tracks turn 180 degrees. From echo, which is the location of the Park City Branch junction, the tracks good down grade into Ogden crossing the Weber river several times.  The Wyoming Division models all 10 UP tunnels and all Weber River crossings. From Ogden the mains go into staging.
Wyoming Division Historical Society Layouts Modeling the Union Pacific from Cheyenne, Wyoming to Ogden, Utah
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