Revolutionary assembly helping to support rail travel (5)
I believe the answer is:
bogie
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" .)