Atlas O Premier S2


Alco’s early diesel switchers, in the 1930s, were characterized by a high engine hood that reached almost to the cab roof. This was necessitated by the height of the McIntosh & Seymour inline 6-cylinder diesels that powered the new engines. Each cylinder in the massive four-stroke motors displaced 1,595 cubic inches, compared with 567 per cylinder in Electro-Motive’s two-stoke diesels.

But in 1939, Electro-Motive introduced its SW1 switcher, with a lower hood and more cab windows that allowed it to brag about “full front vision.” In response, Alco redesigned its engine mounts to allow the motor to drop into a recess in the frame, and in 1940 introduced its S-1 and S-2 switchers, with a greenhouse-like cab that offered ample visibility in all directions. The two models differed mainly in power output. The normally aspirated S-1 with 600 h.p. booted many a small steam switcher from railroad rosters coast to coast. Turbocharging gave the S-2 1000 h.p., allowing it to replace larger steam switchers and branch line engines like 2-6-0s, 2-8-0s and 2-8-2s. The S-series rode on Alco’s own Blunt trucks, named for the in-house engineer who designed them to negotiate the tight turns and less-than-perfect track often found on switching assignments.

Introduced just in time for World War II’s crush of traffic, the S-2 became a best-seller. Rare was the Class 1 railroad that did not own a fleet of them, and short lines coast-to-coast rostered them as well. By the end of production in 1950, more than 1500 S-2s had been delivered. The engines proved extremely durable, with many earning their keep into the 1970s and ’80s, and a number still operating today in tourist railroad and short line service. Like most Alco engines with turbochargers, S-2s are known by railfans as “honorary steam locomotives,” for the bursts of smoke they emit when their turbochargers rev up on acceleration.

Features Include:

  • Intricately Detailed, Durable ABS Body
  • Die-Cast Truck Sides, Pilots and Fuel Tank
  • Metal Chassis
  • Metal Handrails and Horn
  • (2) Handpainted Engineer Cab Figures
  • Authentic Paint Scheme
  • Metal Wheels, Axles and Gears
  • (2) Remote-Controlled Proto-Couplers
  • Prototypical Rule 17 Lighting
  • Directionally Controlled Constant Voltage LED Headlights
  • Illuminated LED Number Boards
  • (2) Precision Flywheel-Equipped Motors
  • Operating ProtoSmoke Diesel Exhaust
  • Onboard DCC/DCS Decoder
  • Locomotive Speed Control In Scale MPH Increments
  • Proto-Scale 3-2 3-Rail/2-Rail Conversion Capable
  • 1:48 Scale Proportions
  • Proto-Sound 3.0 With The Digital Command System Featuring
    Freight Yard Proto-Effects
  • Unit Measures: 12” x 2 3/4” x 3 3/4”
  • Operates On O-31 Curves

Check availability of this product on the Atlas Online Store

3-Rail Item# Road Name Road Number
April 2022
MSRP 3-rail: $619.95
S2 Locomotive
30138047 Undecorated -
30138048 Alaska RR (Black/Yellow) 7112
30138049 Alaska RR (Black/Yellow) 7123
30138050 Atlantic Coast Line (Purple/Silver) 630
30138051 Atlantic Coast Line (Purple/Silver) 633
30138052 Erie Lackawanna (Gray/Maroon/Yellow) 541
30138053 Erie Lackawanna (Gray/Maroon/Yellow) 542
30138054 New York Central System (Black/White) 8542
30138055 New York Central System (Black/White) 8548
30138056 Union Pacific (Black/Yellow) 1036
30138057 Union Pacific (Black/Yellow) 1038
30138058 Western Pacific (Silver/Orange/Black) 551
30138059 Western Pacific (Silver/Orange/Black) 553

Products bearing Union Pacific (UP) and Western Pacific marks are made under trademark license from Union Pacific Railroad Company.