Crossword Genius

Too much pressure above the southern locomotive (10)

Ross

I believe the answer is:

overstrain

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

'too much pressure' is the definition.
The answer and definition can be both types of natural phenomena as well as being singular nouns.
Maybe you can see a link between them that I can't see?

'above the southern locomotive' is the wordplay.
'above' becomes 'over' (I've seen this before).
'the southern' becomes 's' (abbreviation).
'locomotive' becomes 'train' (I've seen this before).
'over'+'s'+'train'='OVERSTRAIN'

Can you help me to learn more?

(Other definitions for overstrain that I've seen before include "too much exercise may produce this" , "Tax" .)

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