In message
,
Mizter T writes

The T4 trains will actually display T4 & 123 as a destination; the T5
trains will show T123 & 5 as a destination.

So for people heading to T123 in a hurry, and the first train is to T4
& 123, perhaps the best strategy is to board it anyway and then lean
out of the carriage at Hatton Cross to see if the platform departure
indicator (assuming that there is one) shows a T123 & 5 train less
than (say) eight minutes behind.

PaulO

I'm not sure there is a "train describer" (in endearing LU lingo) at
Hatton Cross - but if there isn't one, there needs to be!

There is now - it went in a month or two ago when the signalling work
was being done for T5.
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