Posted by Michael Tonne on November 9, 2018  Doyle is wearing the new engineer hat! Posted by Ry Alford on November 10, 2018  What do the numbers under 4449 mean? Posted by Sideline Observer on December 7, 2023  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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