At the moment when everything runs OK the high-peak trains are absolutely fine for getting a seat. The 1724 is always mobbed, yes, but the 1713 is deserted (it skips Hemel and Berkhamsted) and 1730 is usually relatively quiet in the last two carriages. I get to Euston about 5-10 minutes before the train and only fail to get a seat when a train is short-formed.
It's the shoulder-peak that's bad. The 1634 used to be just about OK as a 12-car so London Midland, in their infinite wisdom, cut it to 8-car. The 1654 used to be OK too, but now it's an 8-car 321 and it is rammed.
Saturday mornings are the worst though. A 4-car 350 is the norm for the morning trains into London, and they're always full and standing after Watford. I guess it costs London Midland money to run the extra carriages.
My concern is when they lose the equivalent of two 321s. The only way they'll claw that back is by cutting carriages off other trains. My train in a morning- 0803 off Hemel- is usually relatively quiet as a 12-car (usually four people in a 6-seat bay on a 350/2), but when it rocks up as an 8-car it is full and standing. I don't see how they can keep everything as a 12-car with the loss of two units.
I guess thats indicative of how the "peak" seems to have moved! LM probably still consider that people finish work at 5 and stengthen services between half 5 and half 7 say, when in effect its almost as busy "on the shoulder" as you say.
The Saturday issue is an infuriating one. I know that the morning trains are packed and often only formed of 4 coaches, and yes of course it does cost LM to put extra coaches out there. Also, the /2's are mileage critical being as they're used for almost their entire quota of contracted miles Monday-Friday. However, when enough people complain, as they seemed to for Saturday night services ex Euston for example (seeing many trains formed of 12 coaches after 9pm now) then something may get done!
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What is classed as a "packed train"? Obvioulsy if everyone turns up a minute or two before departure time it gets very packed in a certain part of the train, but you'd be surprised how many peak trains seem rammed in 8 carriages but have 4 with plenty of room in them!
Similary those "savvy" enough to move to a different place on the platform, or turn back on themselves at Euston as highlighted above might think that a train is quiet, where as someone on the same train standing in the middle considers it to be packed! And after all, its only the latter group of passengers who will complain!