What would you call the bottom 2 pieces that go underneath a ho scale train car?

Question by mandylover: What would you call the bottom 2 pieces that go underneath a ho scale train car?
I know the train cars have wheels, but you have 1 piece that carries 2 plastic wheels (on the left side let’s say), and there is another piece (on the right side let’s say) with another 2 wheels? What are those things that carry the wheels called? Mine I have on trains are plastic. I want parts, and I don’t know what to call them.

Best answer:

Answer by untitled too
trucks (like on a skateboard)

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