A northbound Class 501 train calls at Harrow and Wealdstone. The B2 headcode signifies that this train worked the Broad Street-Watford via Primrose Hill (and vice versa) service.
A London-bound Class 501 train calls at Harrow and Wealdstone. The B1 headcode signifies that this train worked the Euston-Watford (and vice versa) service.A refurbished Class 501 train awaits departure time at Broad Street station, shortly before the latter's closure. The B4 headcode signifies that this train worked the Broad Street—Richmond (and vice versa) service.