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This page last updated: December 21, 2012 as of August 2017

Rotary Dumper Building instructions

TL;DR : Coal dumpers need an H bridge underneath to raise and lower the clamps. Coal dumpers are made different than the wood chip dumpers as they are shorter - cut off the parts along the scored lines. I added styrene to the top of the coal cars so they can be used and have locomotives drive though instead of doing the motorized H bridge and cutting the height - they are shorter than wood chip dumpers - to fit the coal gondolas. Superglue something that has a hex screw in it to the plastic gear so the gear can be easily repositioned. Stretch out the springs so they are 'stronger' and hold the coal cars upside down.