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

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

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Steam Boilers, Engines, Nozzles and Turbines
The function of an eccentric rod is

To convert reciprocating motion of the piston into rotary motion of the crank
To provide simple harmonic motion to the D-slide valve
To provide reciprocating motion to the slide valve
To convert rotary motion of the crankshaft into to and fro motion of the valve rod

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