The EMD GT22 Series were first introduced in 1972 after the rise in popularity of six axle locomotives. The GT series now carried a turbocharger that increased the horsepower depending on customer input. The GT series also utilized six axle HTC Trucks, which allowed the locomotive to haul heavier loads at slower speeds with minimal wheelslip. The GT22C series also gave itself various individual designations depending on customer input. Standard suffixes after the model designation were either a U or W suffix to indicate the type of traction motors. A C generally indicated six axle trucks but due to a six axle locomotive being too oversized for most second and third world countries, EMD developed the L suffix to indicate the locomotive was constructed with a Lightweight frame. EMD Dash 2 electronics also became a popular choice for the export railroads by the late 1970s. These designations could apply to any kind of export locomotive design of EMD or another licensee of EMD as long as the electrical & mechanical gear was left unaltered. Overview With the introduction of the 645 engine for export models in 1967, the model designation numbers changed by adding 10 to the designation of a similar model (For example: the G12 now became the G22). To meet customer demands of a six axle version of the popular G12, EMD created the GR12 which was slightly longer and taller to accommodate the Type-C trucks. EMD then designed the GT22 model to accommodate the HT-C truck first found on the American EMD SD45X. Extending the carbody and increasing the fuel tank capacity, the GT22C series was introduced. Production spanned longer than the four axle G22 version, but with smaller orders. Several models were introduced: GT22CW GT22CU GT22CW-2 GT22HW-2 GT22CUM-1 GT22CUM-2 GT22LC GT22LC-2 GT22MC GT22CW The EMD GT22CW was first appeared in 1972 and now carried a CW suffix which indicated that this model had six axles (C) and traction motors that could fit from to gauge tracks (W). Another new suffix introduced to this model was the T, which indicated the use of a turbocharger. The GT22CW found most of its popularity in Argentina, while two unusual orders went to the Saudi Railways Organization in Saudi Arabia & the Société Nationale des Transports Ferroviaires of Algeria. Production spanned from July 1972 to February 1988 GT22CU The EMD GT22CU was first appeared in 1972. Designed mainly for the