I remember when the Mersey line from Birkenhead to Liverpool had 24 trains per hour, and it was like this from 1938 into the 1970s. The terminus at Liverpool Central had just a single headshunt beyond the platforms. Every train in the peak turned round there in 3-4 minutes, there was no space for them to do otherwise. There was no burrowing junction at Hamilton Square, just a flat double junction. Outside the tunnels it was all semaphore signalling. The Rock Ferry line was every 5 minutes at peak periods, the most intensive BR route anywhere. In peak periods I never recall a single delay.
How is this not attainable today?
R.H.N.Hardy, in his autobiography Railways in the Blood, describes how the speedy turnround at Central Low Level was achieved:-
"A train would arrive at one side of the island platform at Liverpool Central, and the driver would leave his cab and walk down the platform to the departure point. Meanwhile a turn-round man would get into the rear cab, propel up to the dead end, the automatic points would change, and in a matter of seconds he would draw forward into the other platform, to be relieved by the waiting driver who had brought the train into Low Level. The turn-round man would then cross the platform to the next train and repeat the cycle"
So, apart from any more recent rules about propelling trains, I guess one of the problems of attaining this today would be finding a shunter/driver prepared to do nothing but perform this manoeuvre for a whole shift!

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