A simple mistype of the destination code could easily make a District Line train from Edgware Road to Wimbledon into a Metropolitan Line train from Aldgate to Chalfont & Latimer - Fast.
That's the reason an I/O gave me a few days back when I caught an all stations "Circle line" service to Uxbridge, whilst the front and side external displays were displaying the anomalous line there were no on train announcements or scrolling dot matrix messages which made a nice change for once.
Have any Green Line staff reciprocated with a District crest on a S8 ??
At school they taught me how to be, so pure in thought and word and deed, they didn't quite succeed Pet Shop Boys - It's a sin (1987) ___________________________________________________________________________ District Dave's London Underground Site Webmaster