These are correctly sized for HOn2 - HO scale on Z track. Z compatible couplers molded onto the body, requires Micro-Trains Z wheelsets or compatible, metal Fox Valley wheels recommended.
UPDATED to reduce Shapeways rejections.
cm:
5.614 w x
5.674 d x
1.368 h
in:
2.21 w x
2.234 d x
0.539 h
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