London has eleven main line stations but if you are thinking about the train to Paris, it leaves from St. Pancras International.
Kings Cross Station
Kings Cross
Kings Cross Platform 9¾ to be specific.
You can take the train out of the station, but you can't take the station out of the train.
London St Pancras International Station.
Paddington
St.Pancras
London Paddington.
the London train station
The busiest train station in the UK is London Waterloo.
train from guildford station to London Waterloo
Take a train from London Waterloo station.