Crossword Genius

Reason to follow crazy train (10)

Ross

I believe the answer is:

locomotive

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

'reason to follow crazy' is the wordplay.
'reason' becomes 'motive' (I've seen this before).
'to follow' means one lot of letters go next to another (some letters go after or follow others).
'crazy' becomes 'loco' (loco can informally mean mad).
'motive' after 'loco' is 'LOCOMOTIVE'.

Can you help me to learn more?

(Other definitions for locomotive that I've seen before include "for moving from place to place" , "Able to move by oneself" , "Railway engine" , "one's attached to the train" , "Rocket, perhaps" .)

I've seen this clue in the Sydney Morning Herald.
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