Illinois Central 121

Green Diamond

The Green Diamond in Milwaukee, Wisconsin, at the Milwaukee Road depot April 24, 1936.

Type and origin Power type Diesel-electric Builder Pullman-Standard Build date 1936

Specifications Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge Fuel type Diesel Fuel capacity 725 US gal (604 imp gal; 2,740 L) Prime mover Winton 201-A Engine type V16 Diesel Cylinders 16

Performance figures Power output 1,200 hp (890 kW)

Career Operators Illinois Central Railroad Official name IC 121 Nicknames Tobacco Worm Locale North America Last run 28 February 1947 Retired August 8, 1950 Disposition Sold for scrap

Illinois Central 121 (IC #121) was a diesel streamliner built in 1936 by Pullman-Standard and powered by Electro-Motive Corporation, which was used by the Illinois Central Railroad on the Green Diamond. Its fixed five-car consist was also the end of an era; the popularity of the early streamliners was their undoing, because the trains could not be lengthened or shortened to handle varying loads. It was the last streamliner built with the power car articulated with the train; future streamliners featured a matched but separable locomotive.The train was painted in a two-tone green livery, "Cypress Green" on the nose and below the window sills with "Cedar Green" above, separated by an aluminum strip. Extensive aluminum trim was applied.

The train's fixed consist was:

All passenger-carrying cars were air-conditioned, with radio communication between them. Full width rubber diaphragms joined the cars, and all cars were articulated (sharing a truck with the neighboring car).

IC 121 operated the Green Diamond service between 1936–1947. The Green Diamond began each morning with an 8:55 AM departure as Train 50 from St. Louis Union Station, arriving at IC's Central Station in Chicago at 1:50 PM. The train was then turned and serviced, for a 5:00 PM return as Train 51, arriving back in St. Louis by 9:55 PM. Seven stops were made en route, and the train ran to a 4-hour 55 minute schedule, being far the fastest of IC's three trains on that route. Wartime in 1943 added an extra 15 minutes to the schedule to cope with traffic congestion, but the train was otherwise unchanged.

On September 29, 1946, with the full dieselization of all Chicago-St.Louis passenger service, the Green Diamond was changed to train Nos. 20 and 21, the reservation requirement was dropped, and the timetable no longer referred to the train as a distinct trainset. Unsurprisingly, the trainset was withdrawn from service on February 28, 1947, being replaced by a new Green Diamond, an E-unit-hauled streamliner with regular lightweight cars.