I have a soft spot in my heart for the Mallard
Perhaps one of the heavy 2-6-4 tanks; took way more shots of LMS 2500 than Mallard when I visited the NRM.
LMS 2500
Oh she is pretty.
In North America, 2-6-4T types were very uncommon, mostly used for commuter passenger service. Not sure if any were preserved; I know of only a 4-6-4T on display in Montreal. This made them very exotic to this colonial.
They're also an ideal size for models-- big enough for all the motion and complex design features, small enough to traverse 50cm radius curves. :)
Oh come on, everyone knows the correct answer is this one 😀 
]face like a british bulldog
The rumble of a class 37 makes it my favourite angine I think
