This is the 2nd train car I designed in my effort to print a train.  The first car was the engine. Link: Train Engine

The Coal Car was fun to design.  Instead of spending hours on Tinkercad finding the right shape for the coal container (I didn’t want a box),  I duplicated the same shape and just slightly increase the size until I had the height I wanted.

The joint to connect the Engine with the Coal Car actually worked.  It was tested previously, but to see it function was amazing.

Object Size (W, D, H): 25, 55.97, 42 mm

Coal Car