In article ,
Colin Rosenstiel writes
How close behind a via T4 train would a T5 terminator have to be for the
latter to get passengers to T123 first?

The advertised running times are 3 minutes from Hatton Cross to T4, and
5 from there to T123. I expect it's also 3 minutes from Hatton Cross
direct to T123. So the answer is 4 minutes.

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