Nice Tango! Didn't know you guys have smokey diesels like that! Can you provide a google maps location where you took them?
We were no strangers to clag mate. That's a clip I found, I didn't take it myself, sorry. I have seen this very loco in action though. Not a lot were built, most have been scrapped. Of the few preserved, the one in the clip I posted is the only one that is privately owned but mainline registered.
As to where it lives, just google 'East Lancashire Railway' and it should be the first link.
The British Rail Class 55 is probably nothing on US diesels, but it's a beautiful beast all the same. Long since out of service regrettably, used in the 60's, 70's and briefly the 80's.
Here are some facts and figures - the Class 55 was a diesel-electric 'Co-Co' configuration loco (two six-wheeled bogies with three axles apiece, all driven) with two Napier Deltic engines producing a total combined 3,300hp, locomotive weight 100 tons, top speed 100mph. Was in its heyday virtually the most powerful loco on British railways.
One interesting fact here - these locos were built by English Electric, who also built the Lightning jet fighter!