N Scale - Bunk of 16 pipes - 24 inch dia. X 20 feet long -- Use on switch machine or other places.

thingiverse

This is a versatile bunk of 16 pipes, each with a diameter of 24 inches and a length of 20 feet. They can be placed on a rack atop the switch machine's slide or used as part of a train load, and can also be positioned anywhere on the layout as needed. The bunk features a flat area at its bottom to facilitate gluing. If you require a flat area on both the back and the bottom for gluing purposes, consider examining alternative options. When placed on a deck with a rack, these pipes can be pushed back and forth to activate the DPST slide switch underneath them, as well as control the turnout via an attached wire. The DPST switch can also alter the polarity of the frog. For more information about the switch machine and its operation, please visit this webpage: http://1fatgmc.com/RailRoad/3D-Printer/3D-Printer-Index.html