I've passed this virtually every day but it was taken me a little while to do so with the camera...It's the on-station post-box - now sealed up - for staff letters!
Yep, that's right - on West Hampstead (jubilee line) station platform there is a room currently used as the waiting room (pic left below) and in the wall is a brass letter box - nice patination! - for STAFF LETTERS.
I noticed another since which if I recall correctly was on either Finchley Road or Kilburn platforms too.
It just struck me as quite quaint really - I guess it dates from the 30's (possibly 50's) but also might post to a level of knowledge and contact between travellers and staff that we would dream of now...
Supermarkets went through a phase of notice boards saying who was who and for a time it looked like public transport might follow suit. But that fad has now passed and it's hard enough to get the name of the station manager these days - but they will prosecute if you assault them...Perhaps this little sealed letter box points to a happier age and interaction from which TfL could take a pointer or two?
