I had one journey Glasgow - Euston on the APT in the short period when it was in public service. On an all line rover, travelling first class, but there was no catering as some cupboard key had gone missing!
The journey was timed to take exactly five hours overall, the same time as the loco-hauled services. The speeds and tilting north and south of Carlisle were very impressive in places, and some whizzing along straighter bits at a speed which I think was above 125 mph. But the stop at Crewe (platform 3 now 11) was quite long, and we crossed from fast to slow at Polesworth, and ambled along the up slow from there to Nuneaton very slowly; I think it was still jointed track then, and quite uncomfortable! But comfort on welded rail was very good; overall the journey was a pleasant and interesting experience.
Somewhere in his thread is a comment that there no Mk 2 catering vehicles. I think there may have been one - M1800. It was always very smart and it usually ran in Birmingham - Glasgow services. But it may have been a modification of something else. I wonder whether it still exists.
John Prytherch.