In message , Steve Fitzgerald
] writes
..- Hatton Cross - T123 - T5 and in reverse, and
..- Hatton Cross - T4 - T123 - HX as at present.

And we've been told that roughly 1/3 trains T4123 and 2/3 123T5

Getting from T5 to T4 seems like the difficult part.
--
Roland Perry