Continental railway in some trouble (5)

I believe the answer is:

metro

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'continental railway' is the definition.
'metro' can be an answer for 'railway' (metro is a kind of railway). I'm not certain of the 'continental' bit.

'in some trouble' is the wordplay.
'in' indicates the answer is hidden within the clue.
'METRO' is hidden in the letters of 'some trouble'.

Can you help me to learn more?

(Other definitions for metro that I've seen before include "Paris subway" , "Urban railway system" , "French underground" , "what moves many Parisians" , "Parisian underground system" .)

I've seen this clue in the Evening Standard.

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