Crossword Genius

How is rail manufacturer going? (6,6)

Ross

I believe the answer is:

making tracks

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

'manufacturer going?' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'how is rail' is the wordplay.
I cannot quite understand how this works, but
'rail' could be 'track' (synonyms) and 'track' is located in the answer.
The remaining letters 'makings' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

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