The most common and most likely answer to this crossword clue is the 7 letter word YARDMAN
I've seen this crossword clue in The Guardian
Y
A
R
D
M
A
N
More clues leading to the result YARDMAN
- Story about a doctor turned railway worker
- Yankee bruiser in Bow, a worker on the tracks
- Met chap who works on the railways?
- Farm worker upturned cart and dung, spilling half
- Story about Madoff’s gardener in New York
- Harry and Mary — one of them works on the railway
- Harry and Mary to get job on farm
- A farm employee, I am randy — dreadfully!
- Measure hand of railway worker
- Take in a Monday cryptic for old rail employee?
Buddy explains!

The straight part
We know that "Met chap/who works on the railways" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case met chap/who works on the railways = yardman.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 YARDMAN mean?
YARDMAN noun- A worker in a railway yard.
- A laborer hired to do outdoor work.