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@miket, most steam engines are able to run forwards and reverse. Therefore, they have the full force of the engine available as engine braking. Of more interest is the coasting drag the engine would have on the engine. No neutral on these - no gearing at all.
@Bicycle Bob, Cyclone's engines run at supercritical steam pressure, meaning enough heat and pressure that the steam is as dense as water. Temps this high allow a much higher output from a compact boiler. It also allows much higher rates of energy transfer for condensing the steam since the temps are so high, allowing a compact condenser.
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