Here are some photos of a Tri-Ang "Castle Class" 4-6-0 and tender. The engine uses the typical six wheeled large Tri-Ang steamer chassis, and the XT-60 motor (UK equivalent to a Pittman DC-60).
Here is the Castle Class with a Merchant Navy 4-6-2 for comparison:
And here is my entire Tri-Ang TT3 loco fleet as of 22Feb2010: