Those contraptions would judder as he worked aboard loco (11)

I believe the answer is:

boneshakers

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'those contraptions would judder' is the definition.
I can't judge whether this definition defines the answer.

'as he worked aboard loco' is the wordplay.
'worked' is an anagram indicator.
'aboard' means one lot of letters goes inside another.
'loco' becomes 'bonkers' (synonyms).
'as'+'he'='ashe'
'ashe' with letters rearranged gives 'esha'.
'esha' going inside 'bonkers' is 'BONESHAKERS'.

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(Another definition for boneshakers that I've seen is " Bicycles".)

I've seen this clue in The Guardian.

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