Fast to Baker St stopping at Wembley

Some semi-fast services do operate in the peaks (and peak shoulders), semi-fast meaning non-stop between wembley and harrow and all stations north of harrow. To that extent it is not strange that landau1945 boarded a 'fast' train at Pinner.

As for stopping at Wembley, it's peak fast services that non-stop. I couldn't say if this normally applies to trains on a semi-fast service. It may vary. There may also be operational reasons for a train to stop (on a scheduled or unscheduled basis) at Wembley Park.

I note the driver announced running non-stop to finchley road. It could be that Wembley Park wasn't a scheduled stop and he was expecting to run through. Or he just made a simple mistake and announced the wrong thing. (This is the sort of time 'fast' trains start stopping at Wembley)..

Most likely is that it was probably running a few minutes late, and was asked to run fast from Harrow to pick up those few minutes. as andypurk suggests, in the interim, it may have been discovered that the train had a crew relief and would have had to stop at Wembley Platform 6. As a "bonus" (though granted not for many) whilst awaiting the next driver, the doors were opened.

It is more common than you may think (and I think it was explored in a thread not too long ago) to alter stopping patterns to regain time. Much better than the alternative short-tripping of the train (which in the case of a Baker Street train, would see you turfed out at either Harrow or Wembley). We usually line up a local line stopper at Harrow alongside, or if not, very soon after.

[puts fingers in ears] blah! blah! blah! don't wan't to hear that blah! blah! blah! [removes fingers]

I'm sure the train simply eased back an inch or so as the driver released the brake and then moved off. Yes?