Wikipedia:" Heathrow Express is an express train service from London Heathrow Airport to London Paddington station in Central London operated by the Heathrow Express Operating Authority, a wholly-owned subsidiary of BAA.

Trains leave Paddington every 15 minutes from 05.10 until 23.25, and there is a similar quarter-hourly service in the return direction. At Paddington, Heathrow Express trains use two dedicated platforms (6 and 7). There are two stops at Heathrow: Heathrow Central, serving Terminals 1, 2, 3 (journey time from Paddington 15 minutes), and Heathrow Terminal 5 (journey time 21 minutes). "