Can You Identify These Black Studless 2x4 Brick With Train Wheels?
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!