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[quote user="GP40-2"]   Unlike other 2-10-2s, the S1a produced plenty of steam at speed, and would routinely run at 70+ mph. <div style="clear:both;"></div> [/quote] Interesting, GP-40, were they capable of gaining these speeds by begin of design, or did they get upgrades later, like a casted frame for example? For example, look at UP 2-10-2, with just one inch smaller wheel diameter, occasionally used as helpers on passenger trains, though, there seems to be no evidence they would have run faster than 50mph. However, first examples occured in 1917 ( those like 5011 stored in Cheyenne). Comparisons of engines usually favorites later builds. Otherwise, I strongly believe that most steam engines build after 1940, were all quite good and far developed by all manufactures and industry standards.
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