Alco RSD15 Phases
Phase I – August, 1956. One handrail stanchion on battery boxes, both air tanks are mounted on the engineer’s side, one above the other, and has a cast steel buffer (coupler box).
- Pennsylvania Railroad 8611-8616
Phase II – March-July, 1959. The battery box now has two handrail stanchions.
- AT&SF 800-808
- Duluth Missabe & Iron Range 50-55
Phase III – July, 1959-March, 1960. Buffer changes from a casting to a welded design.
- AT&SF 809-823, 849
- Southern Pacific 4816-4818, SSW 850-859
- Alco 824
Phase IV – May, 1960-November, 1960. Air tanks are now placed on each side of the unit, and the fuel tank is notched to accommodate them.
- AT&SF 824-848
- AT&SF – An equipment box was added in front of the battery boxes on the engineer’s side, resulting in a third stanchion.
- Pennsylvania Railroad – Small, 2000 gallon fuel tanks; units intended for hump service.
- Southern Pacific – Ratchet-style hand brake instead of brake wheel used on all other units. Radiator expansion tanks were roof mounted, in front of the radiator fan. Both Cotton Belt and Southern Pacific units had a square sand filler hatch centered on top of the short hood, instead of the round filler caps on the notched shoulders as on every other unit.
Modifications after delivery
- AT&SF – Modifications were made to one of the the dynamic brake cooling air intakes and a box mounted on top of the normal roof top panel.
Phase Change Photos
Air Tank Arrangement
Buffer (Coupler Box)
Customer Options Photos
Battery Boxes on AT&SF units