Originally Posted by
Skipness One Echo
Terminal 4 is already on the Heathrow Express. Surely they didn't go to all that tunneling to use it for less than ten years?
The "Heathrow Express" will be diverted from the T123 station along a new branch to T5.
The separate local stations "Heathrow Connect" service will run along the current route to T4 (thus not serving T5).
Passengers will be advised to change trains at T123 and wait (up to 15 minutes) for an appropriate train. If they get on at T4 I presume most will not bother, their train is going to Paddington anyway, they will just stay put.
If you think this is over-complicated, wait till you see what is going to happen to the Piccadilly Line !