Model Train (HO) Wheel Chock

This thing is not intended to be prototypical. Though equivalent prototypical hardware [does exist](https://en.wikipedia.org/wiki/Wheel_chock#/media/File:4011-01_Single_Railroad_Wheel_Chock_with_Flag_(Exposed_Rail)_(Pic_3).jpg), this thing does not resemble it. Instead, this thing facilitates storage, at HO model scale, of rolling stock by preventing the cars from moving freely when placed on track that's been affixed to shelving.

The bottom side of the chock interlocks with the ties of scale track. The thing is compatible with modular track from Atlas, AHM, Life-Like, and Bachmann.

The chock is sized to 9.3 mm diameter wheels.