An HO model of the world’s largest rigid-wheelbase locomotive is available from M.T.H. Electric Trains. The HO 4-12-2 has realistic sounds and smoke that make it a lot of fun to operate, especially on a Digital Command Control (DCC) or M.T.H. Digital Command System layout. And the engine can negotiate 22″ radius curves.
Performance. The model ran well in DCC and DCS modes and accelerated to 75 scale mph, which is close to the prototype’s top speed. Using 128 speed steps in DCC, the 4-12-2 smoothly crept along at .5 scale mph.

In DC the lights and sound came on at 7 volts, and the model started moving at 8 volts. Although our standard speed test for DC goes up to 12 volts, the instruction manual states that the 4-12-2 will reach a prototypical top speed at 16 volts.

The  model will run through no. 6 turnouts and crossovers in the yard on our layout. The 4-12-2 didn’t derail, and the sounds and lights remained constant.

Sounds and smoke. In DCC, the model has 28 user-controlled functions, including the whistle and bell. Function 4 triggers a water stop sequence, complete with a multi-part dialog between the engine crew. Function 5 turns on the cab interior light and the red marker lights and warning light on the tender.

The model’s 10 programmable configuration variables include the long address and acceleration and deceleration rates. The model can only be programmed on the main.

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