FlyerTalk Forums - View Single Post - GUIDE: LHR / London Heathrow Connection, MCT inc. AA T3 <--> BA/IB T5
Old Apr 7, 16, 3:18 pm
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Originally Posted by Calchas View Post
These are trains to and from central London that stop at several stations inside Heathrow, not a dedicated inter terminal train system. You are free to use them within the airport but they are not designed for those connecting within Heathrow. The train stations are not particularly convenient and the trains are infrequent.
Yes. In the T3-T5 instance, Heathrow Express trains are free (within airport confines) and headway between trains is 15 minutes. The train terminal serving T-3 is a walk of perhaps 5-10 minutes from arrivals hall (down at "basement" level) to the Central Terminal.

T5 requires a bit of walking and lifts.

Personally, I'd say 30 minutes is a more realistic and comfortable time for labdside train connections T3-T5. 20 if it all works properly, you know where you are going and walk at a good pace.
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