Thomas Trackmaster Coal Tender Coupling

This is to replace a broken coupling on Thomas Trackmaster trains that have the battery for the engine in a permanently-attached coal tender. If you need the couplings that go between the engine and the cars (non-permanent attachment), check these out:

https://www.thingiverse.com/thing:2104759

http://www.thingiverse.com/thing:1620364

I designed this with notches for a zip-tie to hold the wire in place that runs between the engine an the coal tender. This allows you to just cut the bro