Crossword Genius

Pure bloodlines that carry freight? (5,6)

Ross

I believe the answer is:

goods trains

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'pure bloodlines' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'that carry freight?' is the wordplay.
'that' becomes 'strain' (I can't explain this - if you can you should believe this answer much more).
'carry' means one lot of letters goes inside another.
'freight?' becomes 'goods' (freight is a kind of goods).
'strain' inserted inside 'goods' is 'GOODS TRAINS'.

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