The most common and most likely answer to this crossword clue is the 6 letter word EUSTON
I've seen this crossword clue in The Times
E
U
S
T
O
N
More clues leading to the result EUSTON
- Petition backing high speed rail terminal
- Station us in school
- European Union's hundred miles an hour trains finish here
- London station takes us into school
- School outside American station
- Country club’s fashion stop in capital
- Brexit negotiators’ 180º change of direction is terminal
- End of line for some, including setter and solver in old school
- Refrain from taking action over training centre?
- Station 1 across and down together in school
Buddy explains!

The straight part
We know that "London station" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case london station = euston.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.