Train stops working when given to US railway (6)
I believe the answer is:
diesel
'train' is the definition.
(I've seen this before)
'stops working when given to us railway' is the wordplay.
'stops working' becomes 'dies' (I've seen this in another clue).
'when given' says to put letters next to each other.
'to us railway' becomes 'el' (I can't justify this - if you can you should give a lot more credence to this answer).
'dies'+'el'='DIESEL'
Can you help me to learn more?
(Other definitions for diesel that I've seen before include "Train perhaps" , "Common fuel for heavy vehicles" , "See lid, oddly, of the fuel" , "Type of engine" , "Fuel for heavy vehicles like lorries" .)