I found a bunch of Pat Pend LEGO in a thrift shop. Among all the goodies there are two black smooth 2x4 bricks with train wheels attached to them.

Their characteristics are as followed:

  • They are studless.
  • Have a closed bottom.
  • On one of the long sides there is a half moon like cut-out with a sort of flat hook thing.
  • On the short sides there are detachable train wheels with ten spokes.
  • The wheel axles are made of yellow brass.
  • The logo on top is the old LEGO logo with the letter "O" being open.
  • The logo is quite large.

Can anyone help me identify these parts?

1 Answer 1


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Hey, there Happy Dog! These train pieces?

  • Part #BB37 - Train Brick 2 x 4 x 1 1/3 Sliding Block with Wheels Holder.
  • Part #Wheel2A - Wheel Spoked for Motor.

Together they appear in these LEGO sets.

See ya!

  • 2
    Thank you so much Rin Rio-Oki. That are the blocks!! You identified them and did that very fast. This forum is amazing. Lego made so many different parts, without a community of adult Lego lovers it would take so much time to identify every little bit of it. And I'm a beginner, but willing to learn. Thanks again. Cordially, Happy Dog.
    – Happy Dog
    Dec 2, 2018 at 9:07

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