Needs a radio antenna platform, a centered exhaust stack (Santa Fe rebuilt the turbo charger and the stack was centered and turned longitudinal to the body) and a silver (stainless) panel underneath the grill behind the cab door. The only ones with a red panel there were 59, 62, 70-73 and 76-78, late additions to the series when the L-A-B lashups were broken up and the "B" units became 62L-69L and 74L-75L. 60 was odd in that it had Farr grills from the cab door to the rear and didn't have the curved drip strip on the side. 74 also had Farr grills but with the drip strip.
Oh yeah, almost forgot, the original steam generators were replaced with Vapor Clarkson units so the vents and such were the same as on F-units - rectangular box replaced with round screened vent.