Steam Boilers, Engines, Nozzles and Turbines
The Locomotive boiler has

157 fire tubes and 24 superheated tubes
167 fire tubes and 14 superheated tubes
147 fire tubes and 34 superheated tubes
137 fire tubes and 44 superheated tubes

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Steam Boilers, Engines, Nozzles and Turbines
The relative efficiency is defined as the

Ratio of brake power to the indicated power
Ratio of thermal efficiency to Rankine efficiency
Product of thermal efficiency and Rankine efficiency
Ratio of heat equivalent to indicated power to the energy supplied in steam

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