The most common and most likely answer to this crossword clue is the 5 plus 9 letter word CREWE ALEXANDRA
C
R
E
W
E
A
L
E
X
A
N
D
R
A
Buddy explains!
The straight part
We know that "Railwaymen" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case railwaymen = crewe alexandra.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.