Cryptic crossword clue
Those contraptions would judder as he worked aboard loco 11

The most common and most likely answer to this crossword clue is the 11 letter word BONESHAKERS

I've seen this crossword clue in The Guardian
B
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Buddy explains!

The straight part
We know that "Those contraptions would judder" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case those contraptions would judder = boneshakers.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does BONESHAKERS mean?

BONESHAKERS noun
  1. A velocipede (the bicycle of the late 1860s).
  2. Something jolty.

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