Sc. 387 - 11/22/37 - 35g brown-red
Centenary of Austrian Railways
Bo-Bo class 1170.2 electric locomotive & passenger cars emerging from tunnel

What does "Bo-Bo" mean?
Briefly, "Bo-Bo" denotes "an engine with two bogies with two individually powered axles each."
So what's a "bogie" - well, that's the "European term for truck (see truck)".
I poked around on the WWW, and here are a couple of web sites to help you get started on the terminology, if you are as clueless as I:
A Glossary - (see "bogie" and "truck")
The best definition (with images) of "Bo-Bo" I found.

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