Alco RSD15 Phases

RSD15 Builder List | RSD15 Roster Index

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

Customer Options

  • 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

Alco RSD15 air tank arrangement, engineer's side
Alco RSD15 early air tank arrangement, engineer’s side
Alco RSD15 early air tank arrangement - fireman's side
Alco RSD15 early air tank arrangement – fireman’s side
Alco RSD15 air tank arrangement, late
Alco RSD15 late air tank arrangement, both sides symetrical

Buffer (Coupler Box)

Phase I-II style coupler box (buffer). ATSF RSD15 9800, unknown date and location. Photographer: Stan Kistler
Alco RSD15 cast buffer
Alco RSD15 welded buffer
Alco RSD15 welded buffer

Customer Options Photos

Battery Boxes on AT&SF units

Alco RSD15 battery boxes on all units except AT&SF
Alco RSD15 battery boxes on all units except AT&SF
Alco RSD15 tool box added to AT&SF units
Alco RSD15 tool box added to AT&SF units for extra brake pipes and air hoses

 

Brake wheels and ratchet used on SP 4816-4818

Alco RSD15 brake wheel used on all units except SP 4816-4818
Alco RSD15 brake wheel used on all units except SP 4816-4818
Ratchet type hand brake in recessed opening, used only on Southern Pacific 4816-4818
Ratchet type hand brake in recessed opening, used only on Southern Pacific 4816-4818

Expansion Tank on Southern Pacific/Cotton Belt units

Radiator expansion tank on Southern Pacific and Cotton Belt units
Radiator expansion tank on Southern Pacific and Cotton Belt units
Alco RSD15 radiator without expansion tank
Alco RSD15 radiator without expansion tank

Sand Filler on Southern Pacific and Cotton Belt Units

Alco RSD15 sand filler hatch, square
Alco RSD15 sand filler hatch, square
Alco RSD15 sand filler hatch, round
Alco RSD15 sand filler hatch, round

Modifications after delivery

Dynamic Brake Modifications on Santa Fe units

Alco RSD15 dynamic brake
Alco RSD15 dynamic brake
Alco RSD15 dynamic brake modifications on AT&SF units
Alco RSD15 dynamic brake modifications on AT&SF units