N Scale -- 4 foot X 8 foot crate that can be used on switch machine or other locations.
thingiverse
People use 4 foot by 8 foot crates that can be placed on a rack or other deck on top of a switch machine's slide. They also use these crates as a train load or place them anywhere on the layout. When you put one of these crates on a deck with a rack, you can push it back and forth to activate the DPST slide switch underneath it. This motion also flips the turnout via the control wire connected to it. The DPST switch is capable of changing the polarity of the frog. To learn more about how this switch machine operates, check out the link below: http://1fatgmc.com/RailRoad/3D-Printer/3D-Printer-Index.html
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