and early 1970s, MK was involved in the construction of the Hamersley & Robe River and Mount Newman railways in the Pilbara region of Western Australia. From 1962 to 1972, MK managed a joint venture to serve the U.S. military as civilian contractors for infrastructure in the Vietnam War; in 1971, they constructed 384 of the infamous "tiger cage" cells of was called RMK-BRJ and included Raymond International, Brown & Root, and JA Jones Construction MK was also involved in the construction of rail projects such as the Bay Area Rapid Transit (BART) extension (MK also built 80 C2 cars for BART in 1994) and the single track Apoera-Bakhuys Railway in Suriname (1976–1977). Rail and transit MK Rail Morrison–Knudsen established a separate rail systems division in 1972. Initially, the company rebuilt locomotives, such as the four Delaware & Hudson ALCO PAs. It rebuilt four Southern Pacific GE U25Bs with a Sulzer V-12 prime mover. These locomotives, designated M-K TE70-4S, operated from 1978 to 1987. built locomotives, originally under its own name and later under subsidiary MK Rail from 1994 to 1996, such as the MK5000C and the F40PHM-2C. Its Australian operation, based in Whyalla, South Australia, rebuilt 17 CL and eight AL class locomotives for Australian National and six DE class locomotives for BHP in the 1990s. Morrison–Knudsen spun-off MK Rail in 1993; it became a publicly traded company in 1994. After Morrison–Knudsen's bankruptcy in 1996 the company renamed itself MotivePower. The company merged with Westinghouse Air Brake Company in 1999 to form Wabtec. MotivePower is now a wholly owned subsidiary of Wabtec. MK Transit MK also entered the passenger railcar rebuilding market in the 1980s, initially located at the former Erie Railroad shop in Hornell, New York. It overhauled and rebuilt many New York City Transit subway cars between 1984 and 1992 including all R26/R28s, all R29s, most R32s, some R36s (through a pilot program), many R42s, many R44s, and all R46s. It also overhauled NJ Transit's Arrow I series cars, converting from electric MUs to Comet 1B push-pull coaches, and SEPTA's Silverliner II and III series electric commuter cars in the late 1980s. Vehicles overhauled in the 1990s included Metra Highliner I EMU cars, an Amtrak Turboliner RTL-II, as well as BTC-1C passenger cars and US Standard Light Rail Vehicles for the MBTA. MK later expanded into building new cars, taking over the former Pullman Company factory in