When getting a tube (underground) train you should look at the line your chosen stop is on (Victoria, Northern. Piccadilly etc) & note the colour.
The destination of any train is the terminus (end of the line).
If I got on from Heathrow & wanted to go to Vauxhall (God forbid) I would change at Green Park on to the Light blue tube line (Victoria Line) & look for trains headed for Brixton (this one goes South) as it should stop at Vauxhall.
Sometimes trains stop earlier on the line & the announcement will say "This train terminates at . . . (X station)"
If you have to change at Earls Court this is more difficult as several lines go through here. Again remember the line colour you want & look at the maps.
Each platform will have a picture of where the next train can go.
Don't always think that asking someone will be the answer as lots of nationalities who think they know London & the tube system will try to help & only be correct sometimes.
I know the system enough but tried asking people to help me out of curiosity & many people were just wrong with their answer.
Source(s):
|Working, living near & being a tourist in London is my qualification.