A recent thread on "balloon tracks" led me to create this post about the construction and function of hidden staging yards on my railroad. Following concepts in Frank Ellison articles - the railroad is the stage, the trains the actors, and the timetable/train orders the script. When not on a run, I’d like most “through” freight and passenger trains to be waiting off stage. - thus the requirement for large capacity hidden staging yards. To find space for balloon staging tracks I used a layered design approach influenced by John Armstrong, and lessons learned on my prior railroad (see March 2000 MR).
The first 5 photos show construction of the suspended Pittsburgh Division staging yard. It is located directly above the Altoona yard and one of the main aisles. For ease of installation it was built before the Altoona yard bench-work went in. The staging bench-work was built on the floor using 3/4" plywood in 7 sections. It was then hung one section at a time from the floor joists above by 1/4" threaded steel rods. Four nuts on each rod made leveling adjustments easy. 3’8” lap plates on the upper surface secure the sections to one another. With the full structure in place I laid Homasote roadbed and then the track (the Homasote was routed 3/8” where it crossed the lap plates). With the track and turnouts down, I sheathed the sides of the structure with strips of 3/8" bending plywood (a.k.a. wiggle wood). It served to hide the trains from below while allowing ladder access for maintenance.
The Middle Division Staging yard was a lot easier to build as it sits flat on open grid framework – directly below the Horseshoe Curve. The photo below shows the completed Middle Division staging yard in the foreground, and in the distance is the yet to be connected Pittsburgh Division staging yard loops Once the Middle Division staging was operational work began on the winding 2.2% Pittsburgh division helper district grade west of Altoona, around Horseshoe Curve, and on the Gallitzin tunnel entrance to Pittsburgh Division staging.
The photo below shows the Horseshoe Curve being built over the top of Middle Division staging using L girder framing. The curved stud wall will support a double faced backdrop separating the Curve from the single track Tyrone and Clearfield coal branch.
The finished Curve scene. If you look closely in the foreground you can see the outline of a 2" thick foam lift out panel which provides access to the staging track below.
This photo shows MG interlocking, the Gallitzin tunnel face, and the suspended Pittsburgh Division staging.
Both staging yards on the layout are monitored by occupancy detection circuits and closed circuit video.
Closing reminder: if you are going to build a layered railroad carefully plan the construction sequence, and make sure you have provided maintenance access to hidden tracks.