Although those two services are described in the timetables as 6 cars, in practice they never are. Just the West Kirby line in the evening peak, as I say, gets a single 6 car set. If you're looking for pairs, the Northern Line is the place to be, with a total of eight scheduled pairs in the evening rush.
Thanks for the further info. All Ellesmere Port trains I have recently used in the afternoon peaks have indeed been 3 car, although I can't remember the exact times, but this does seem correct. They just need to amend the timetable accordingly now! Although to be fair it does say "subject to availability".
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I find it strange that today's offering is so sparse by comparison. However the other big thing that happened in 1971 was the opening of the Kingsway road tunnel.
Yes it's an interesting comparison. Born in '73, I'm a bit too young to remember the set-up before the loop line, although I well remember riding on the class 503 trains, and having to change at Rock Ferry.
Other factors in the reduction of services may be that you can now get direct buses from most parts of the Wirral to Liverpool. (This wasn't possible prior to the 1986 deregulation). As it happens I almost always get the bus to work in Liverpool, as when time is of the essence, it's handy in that I live nearer to the bus stop than the station!
Also, there had been a general population decline in Merseyside throughout the '70s and '80s.
Of course as you say the opening of the Kingsway tunnel and no doubt car usage has continued to increase during the last four decades.
Having said all that, Merseyrail trains have in practice seemed to be getting a bit busier again over the last few recent years. Not sure what the stats actually say though.