Hope you're into English Electric. We've got some of that coming up within the next 6 months, mostly with 37314, 40012 and 50007. With a bit of luck, 40012'll be fired up in a fortnight for the first time since early September.
They will smoke when you fire them up in cold air, especially if they've been shut down for a day or two. Diesel locos and units being restarted about now after their xmas break will create a good sight 8)