'Big Boy' locomotive differences from 2019

Steam motive power and operations in the Americas.
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John Ashworth
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'Big Boy' locomotive differences from 2019

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Union Pacific Big Boy differences from the 2019 tour
These 5 changes make Big Boy 4014 physically different from 2019 and even more unique among surviving locomotives...

cylinder head and piston head covers... Extended range oil reservoirs for the mechanical lubricators... Builder’s plates... Positive train control... chalk writing...
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