As a member of the Alco-GE "DL100 Project" introduced in 1940, the DL-109 was among the American Locomotive Company's (Alco) early entries into the passenger diesel market. Alco hired noted industrial designer Otto Kuhler to design its distinctive carbody. With its sleek lines, knife-edged nose, three-panel windshield and long wheelbase, it was ideally suited for high-speed service. The 2,000-horsepower DL-109 was powered by twin McIntosh & Seymour 539 prime movers, the same engine that powered the popular RS-1 roadswitcher.
 
While designed as a passenger locomotive, the DL-109 could also handle high-speed freight with ease. In fact, its dual-service capabilities allowed its very construction; Alco was permitted to build 60 units for the New Haven in the face of wartime restrictions on passenger-only locos. The units performed admirably round the clock, handling passengers during the day and freight trains at night. Using lessons learned with the DL-109, it was succeeded by the famous PA-1 in 1946.
 
A fitting tribute to these classic diesels, the models feature: * LED Headlight * 8-Pin NMRA DCC plug * Heavy Diecast Chassis * Advanced Coupler Design Allows Operation on 18" Radius Curves * Magnetic Knuckle Couplers * All-Wheel Drive & Electrical Pick-Up * Dual Machined Brass Flywheels

Paint schemes and roadnumbers are as follows:
ATSF #50
CNW #5007A
GM&O #270
GM&O #271
MILW #14A
MILW #14B
NH #0708
NH #0709
RI #622
RI #623
SOU #6400
SOU #6401
Undecorated