What is the significance of EMDs serial numbers from 1972 on?
The first two digits appear to be the year the order was placed, while the last two to four digits appear to be sort of a sequential order number. However, since 1975 the last four digits are usually 6xxx or 7xxx, so this can’t be much of a sequence. (Richard Barnes) The first two digits are the year the initial inquiry and bidding was done on the order. The actual order may have been placed then, or later. The order numbers are assigned at this time, even if the bid does not result in an order there is an order # assigned to it. The third digit indicates the type of order, i.e. if it is an export order that digit is an 8, components for locomotives to be built elsewhere get a 9. Domestic orders get a 6 or a 7. Marine power plants and other products get other digits. The last three digits are in sequence from 001 and up. They used to start these numbers at 001 at the start of every year but lately they have let them run awhile before going back to 001. (Doug Cummings) I’ve found a numb
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