Originally the lawn was the area next to the station masters' house. Then it was where the engine turntables were before it became the parcels area.
Passengers who stayed at the Great Western Royal Hotel crossed the area on a high footbridge.
In this area now is the entrance to the Underground.
It is also filled with restaurants and shops.
You can also check you baggage in for Heathrow Airport in the world's largest 'city centre' check-in.
The Lawn today