People like to point out that the Manchester - Liverpool trains were faster in the days of steam.
I have no idea whether they are correct, but I think its fairly meaningless to compare one "fast" service a day with a frequent service nowadays that has a robust timetable (did all of these "fast" trains arrive within five minutes at the terminus etc etc).
Back in the days before nationalisation, there was great competition for business between Manchester and Liverpool.
The Cheshire Lines Committee[CLC] from Manchester Central to Liverpool Central and the LNWR from Manchester Exchange to Liverpool Lime St both competed for a 40-minute journey time, and these were regular services, not just "one-offs"
Admittedly, the CLC and LNWR had easier routes than their equivalent today. For example, the CLC had a straight run out of Manchester Central, with cut-offs avoiding Warrington and Widnes and a straight run from Hunts Cross into Liverpool Central via St Michael's. Today, their equivalent trains have to negotiate Manchester Piccadilly, Oxford Rd, Castlefields Junction, the severe curve on to the LNWR at Allerton and the slow route through Edge Hill, in addition to serving Warrington Central and Widnes.
Similarly, the LNWR expresses from Manchester Exchange had an easier run -no busy Ordsall Lane Junction to negotiate, stopping only at Newton-le-Willows or Earlestown, or neither, and four-tracks between Huyton and Liverpool Lime St, allowing slower trains to be overtaken.
And in the days when you could thunder through Kirkby, unhindered by buffer-stops, and steam straight into Liverpool Exchange, even the L&Y, with its longer 36.5 mile route tried to compete with the 40 minute schedules by using the Brindle Heath flyover, the fast lines through Atherton, etc, the Pemberton loop avoiding Wigan Wallgate, and very lightly-loaded trains.
So, yes - a regular 40-minute service was offered then - which is why I tend to greet the spin that an electrified TPE service from Liverpool Lime St to Manchester Victoria via Chat Moss will introduce faster journeys with a hollow chuckle. Perhaps we might even achieve what was done on a daily basis in the 1930s.