Because trains require maintance so some need to be taken out. simple fact is trains were lengthen providing much more capacity anyway than simply running a Saturday service would have.
I'm very dubious about that assertion. On South West Trains (my area), on Sunday
- the Portsmouth service is halved
- the Alton service is haved
- the Salisbury service is halved
- the Southampton service is reduced by a third
So I doubt if train lengthening could compensate. In any case some Southampton/Bourmnemouth services are already 10-car Class 44 on Saturday evening so no lengthening is possible.
My experience on Sunday was that I came up from Fareham to Waterloo. The normal 5-car Class 444 from Portsmouth Harbour joined up with another 5-car 444 from Poole at Eastleigh to make a 10-car train (standard Sunday practice). It was standing room only from Winchester.
Despite the leisurely Sunday timings and the general lack of trains we were still 10-mins late at Waterloo at 10:45. The reason given was that we were following a stopper from Surbiton, which was plausible as the slow down started there. No explanation awas given as to why the stopper was routed onto the fast lines. If 'Planned egineering works' was the reason, the person who organised them for Jubilee Sunday should have been fired.
Returning home, Waterloo was packed out from about 18:00 to 19:00 when I was there. It seemed pretty obvious that a Saturday service was needed but. as we know, that was not on offer. I got on the 18:54 Poole/Portsmouth which was full and standing to Basingstoke (though I had a seat).
As we passed Clapham Junction there was an empty 10-car Class 444 heading to Waterloo which had 'Jubilee Special' on it. It would appear as if it was some belated attempt by SWT to run an extra train to cater for the demand. Though what it was I have no idea as there was no indication of any extra service being run either at Waterloo or on SWT web-site.
My impression of the whole day and the efforts of the TOCs to run a full service for such a busy event - 'Pass' or 'Fail' ? Well, being kind they might just scrape a bare Pass, but that is all. They certainly didn't paint themelves in glory. Things could have been a lot lot better. The crowds were quite anticipated and up to Royal wedding levels of last year. So the TOCS knew what to expect ... and that was a Saturday.
Somebody somewhere must have made an awful lot of money yesterday. Maximum number of passengers and minimum level of train services gives a huge profit. So someone is happy. It's a pity it is not the passengers.