3 Rail O Gauge Toy Trains
Runner and Guest Access Bridges
Lift Out Bridge Updated with MTH 40-1031 Arch Bridge
Atlas 3-Rail Pratt Truss Bridges with Lift Assist
see Construction Photos and Drawings for Atlas 3-Rail Pratt Truss Bridge with Lift Assist
The CEO (Chief Engineering Officer) started design and construction
with Atlas 3 Rail Pratt Truss Bridges and designed 2 deluxe access
bridges for the SSPRR Run Room.
Thanks to the Run Room CEO, bridge performance has been exceptional
for years. Gas
springs hold the bridges up. The custom hinges and
spring hardware increase the stability of the bridges.
The added hardware is attached to the existing Atlas steel
straps inside the girder slots.
The Completed Double Track Bridge as built from the Construction Drawings
The modified Atlas #6921 3RL Double Track Pratt Truss Bridge Kit has custom hinges and "lift Assist".
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| The modified Atlas #6920 3RL Single Track Pratt Truss
Bridge Kit also has custom hinges and "lift Assist" The single track bridge super structure is used on the Run Room Ceiling Track Crossover. The maintenance department has neglected to install the safety cable railing for the single track bridge. Construction photos and drawings are posted for your use. |
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| Engine safety electrical circuits prevent an Ooops.
This Lionel 671 is diving into the hole where the bridge is
open. See Engine Safety Relays for protection at the Atlas lift bridges. See Access Bridges used as Switches for more circuits. |
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Atlas 3-Rail Two Track Pratt Truss Bridge with Lift Assist
installed before tables are finished and track is laid.
The gas spring starts holding the bridge about half way to
all the way up. |
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| The fabrication variables between the single and double track bridge are noted with the Construction Photos and Drawings. The single track bridge is configured to stay up at an 80 degree angle instead of 85 degrees to prevent collision with the Ceiling Track structure.  |
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Click on photos to see the bridge locations in the Run Room.
Construction photos and drawings are posted for your use.