Again, that's as maybe. Today there were just 4 5-car trains, 1 4-car and the rest were 3, apart from the 2 car. Anybody fancy 2-cars from the far SW of Wales through Cardiff at commuter time?
I was on the (thankfully 4-car) 1504 from Milford Haven about 10 days ago, fairly well filled and after Salop it was announced that the rear 2 were coming off at Crewe. Cue family with several kids and loads of camping equipment struggling through the train repeatedly with stuff to get into the front 2 vehicles... then the guard announced that we stood at Crewe long enough for people to get up the platform to get in the front set! (By which time there were only about 4 people in the rear set anyway.)
At least most departures from Manc are now 3-cars, which is a significant advance (people in London-land please note!)
It’s always a maybe. There is always a chance something goes wrong and either there is a substitute or cancellation.
Maybe I am missing your point ?
At one time, you’d be lucky to get 1 MK4 set out on a given day. There were lots of in service failures and the 175’s were going off lease and we had a stream of 2 car 150’s or 2 car 153’s operating the majority of Manchester to Cardiff (and further) services every day.
When we talk about how far things have come, we are not saying everything is almost where it should be with almost every service leaving Manchester being planned either a 5 car 197 or MK4.
We are talking about how we get a pretty reliable set of MK4 diagrams, even half of the 5th diagram is starting to get covered, and a very limited number of 2car 197’s (which are a big step above 150’s and 153’s in many ways).
There is still, I believe 4, 3car 197’s to come into service and the 197’s are still covering for 230’s, 231’s/756’s and the MK4’s if there is a gap in the diagram that needs covering.