More cracking pics Jeff - but as for that UID 37
The same train has now passed the photographer, I believe the loco to be 37021. It, too, only has a yellow for the bank.
Wouldn't be 37021 - that was a split boxer - see http://farm6.staticflickr.com/5150/5662448361_c4d0b5d1a4_z.jpg
Your loco is a centre boxer with roof mounted horns - 37201 perhaps?
Cheers
Phil