Whistle while you work!

If you mean all trains entering or leaving Wimbledon during daylight hours recently, this is due to maintenance staff being near the track just outside the station.

It's not uncommon.

Perhaps, but to be honest I don't expect you'd find many pedestrians crossing INSIDE the tunnel at Fulham Broadway, or even on top of the viaduct between Putney Bridge and East Putney etc.

I was referring to track workers being about the line, rather than pedestrians. Naturally, if there were pedestrians about the line I'd expect there to be minor delays on the branch.

Be thankful it is a whistle and not a horn ;D

XF

Not the LU, but I was watching a cab ride from back in the late 1980s from Sheffield to Cleethorpes and the driver laid on the horn at every opportunity - with multiple tones and bursts. It got extremely annoying very fast.

In that instance, the repeated horn blowing would probably be more to do with safety at level crossings - there's rather a lot of them in the flat lands of Lincolnshire!

On the Metropolitan fast lines north of Harrow, there are whistle boards located by every local station. Every Met and Chiltern train on the fasts would blow their whistle/horn as they passed each station. The fast trains rarely whistle/horn these days when passing stations presumably because of residential complaints!

IIRC there are three LUL whistle boards on the short distance between Amersham and the foot crossing north of the station. Every Chiltern driver would blast long two tone horns when approaching each board. Now they generally blow just one single short tone for that stretch.

There's a whistle board also at Finchley Road on the Northbound Met lines.

It wasn't me

I was on the Circle Line the other day and the driver was a little whistle happy too!

The most common reason for whistling in a platform isn't for a near-miss or one-under specifically but more as a warning or for summoning station staff.