Simple Horizontal Engine
The iron tier's dedicated mechanical-power engine: the crank sits at the standard shaft height, so it drives a line directly where the Watt engine needs a beam tower. Wants a Cornish boiler at 4 to 6 atmospheres; venting the exhaust is base efficiency, and piping it to a jet condenser is a bonus. The engine's process is not built yet.
The iron tier's dedicated mechanical-power engine. Its crank sits at the standard shaft height, so it drives a line of shafts directly where the Watt Beam Engine needs a beam tower instead. It wants a Cornish boiler running at 4 to 6 atmospheres; venting the exhaust to the air is base efficiency, and piping it on to a Jet Condenser is a bonus.

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