The last B-unit that EMD has produced, to the best of my knowledge, was the GP60B. The units were made for the Santa Fe and wore the warbonnet paint scheme. When they first came out, it was not uncommon to see A-B-B-A sets of GP60M's and GP60B's running together. On this day, BNSF 332 - now wearing the Heritage 1 scheme - sits in Denver.
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