Out of what I've travelled on, probably HSTs and the 91s on the ECML. Love the sound and sheer power of both of them, but also find the coaching stock to be spot on. Both pre and post-refurb.

I also quite like the 185s that TPE use. The only downside for me has been that they're unsuitable for the loads that they carry... if they were longer sets, they would have been ideal.

Out of the new stuff, I the way both the 80x IEPs accelerate and I don't find them too uncomfortable. Likewise, I like the way the 700s accelerate on the Thameslink. They are brilliant for the work they do down there, although they're not the most comfortable things in the world... you get quite numb doing one all the way to Brighton!