In message , steve
writes
Taking full trains out of service and holding full trains does not
benefit most people but makes the lights on the screen more even.
I would doubt that "full trains" are taken out of service unless they
fail a trip tester or some other related safety problem, perhaps you
don't mind unsafe trains, but look at the fuss when two trains collide
and you want the person responsible to be hung drawn and quartered.
--
Clive.