Crossword Genius

Revolutionary assembly helping to support rail travel (5)

Ross

I believe the answer is:

bogie

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'revolutionary assembly helping' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'support rail travel' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?

'to' acts as a link.

Can you help me to learn more?

(Other definitions for bogie that I've seen before include "A four-wheeled truck" , "Freight truck" , "Rail wheel assembly" , "Part of carriage" , "Wheeled undercarriage that supports a rail car" .)

I've seen this clue in the Evening Standard.
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