Allen Hazen wrote:Not on the serial number topic, I know, but the truck illustrated in the DRT article on the U-5B… The rubber suspension elements look like a laminated structure: several alternating layers of rubber and and metal plates. This sort of element was introduced by GE on domestic units several years later, on the "FB" trucks (FB-3 introduced on late U28C in 1966, FB-2 as an option on 4-axle domestic U series starting around 1973).
(One more example showing why American railway historians OUGHT to know more about export locomotives: technology used on domestic units in some cases was introduced years earlier on export units.)
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