Doyle is wearing the new engineer hat!
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What do the numbers under 4449 mean?
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GS represents the class of locomotive: "Golden State" or "General Service" depending on the point in time.
The "80" denotes the diameter of the main drive wheels.
GS-4, at far right, is the specific class this locomotive belongs to. SP had classes GS-1 through GS-8.
25 1/2 is the cylinder diameter, 32 is the cylinder stroke in inches.
276 is the weight on drivers in thousands of pounds
B-118 and -SF, I do not know.
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