Not directly comparable, I guess, but I have found the timetable for the Liverpool (Exchange) - Southport line from 7 May 1973 onwards.
Most 'all stops' journeys Southport - Liverpool were scheduled in 39 minutes, with generally a 15 minute headway.
There was one Monday - Friday journey that left Southport at 0816 (eleven minutes behind the 0805 'all stops'), which called all stops to Formby (0830 - at which point it was still 11 minutes behind the one in front), and then went non-stop to Liverpool Exchange, arriving at 0846 - two minutes behind the 0805 ex Southport. This journey was thus scheduled in precisely 30 minutes, end to end.
Most 'all stops' journeys Liverpool - Southport were scheduled in 38 minutes - again with the same general 15 minute headway.
There was a Monday - Friday journey that left Liverpool Exchange at 1702, ran non-stop to Waterloo (1711), and then called all stops to Southport, arriving at 1735, so 33 minutes end to end.
There was also a Monday - Saturday at 2315 from Liverpool Exchange, calling only at Waterloo, Blundellsands & Crosby, Formby and Ainsdale that was scheduled to arrive in Southport at 2343. This journey was thus scheduled in 28 minutes end to end.
I have also found the Liverpool - Rock Ferry [change] - Chester timetable for the same period.
Including the change at Rock Ferry, most services from Liverpool to Chester took 50 minutes, Monday - Saturday. The general pattern was
Liverpool Central xx25
Rock Ferry (arr) xx37
Rock Ferry (dep) xx38
Chester (arrive) xx15
In reverse, the general pattern was:
Chester (dep) xx25
Rock Ferry (arr) xx58
Rock Ferry (dep) xx06
Liverpool Central xx18
... most journeys thus taking 53 minutes, with a more comfortable allowance to change trains at Rock Ferry.
However, on Sundays, the Rock Ferry - Chester DMU service called only at Bromborough, so the service was far quicker. No nice 'clock-face' frequency, but eleven trains each way, with a total journey time of typically 39 minutes Liverpool - Chester, and as little as 36 minutes for one or two of the Chester - Liverpool services.
For example:
Liverpool Central 0910 - Rock Ferry 0922 [change] Rock Ferry 0926 - Chester 0949. 39 minutes.
Chester 1010 - Rock Ferry 1032 [change] Rock Ferry 1034 - Liverpool Central 1046. 36 minutes.
Edit:
I should have added that on Sundays, there was even an 'extra' (to the standard 30 minute frequency) EMU from Liverpool Central to Rock Ferry at 1156 (arriving in Rock Ferry at 1208), whose sole purpose appears to have been to offer a connection into the 1216 DMU to Chester. Without this, the connection into the 1216 ex Rock Ferry would have been the [standard clock-face] 1140 ex Liverpool Central.