The GG1, one of the PRR's most famous and recognizable locomotives, is also one of the most curiously designed. Technically two locomotives under one shell (a "G" class locomotive is a 4-6-0 by PRR specification, therefore the GG1 was two "G" locomotives in a 4-6-0:0-6-4 arrangement). This added up to a 4.6k horsepower locomotive that was staggeringly powerful, even by today's standards. Designed in the 20's, built in 30's, and not retired until the 80's, the GG1 had an incredible lifespan and survives today as a testament to its time in both its unique Loewy-design and overwhelming performance.
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