I went to the Severn Valley Railway again today (second time this year) and enjoyed some "thrash" behind 55 019, the Deltic which is visiting for the Summer. While Deltics arn't my favourite diesel locomotives they certainly sound good, well 3,300hp is unlikely to sound bad!
I travelled behind it up to Bridgnorth and back and stuck my head out of the window to breathe in plenty of fumes (as you do!) I was also able to photograph one of the rebuilt "Ultra 73s" which is at Kidderminster for some reason (driver training or testing probably). You can see my photographs here.