Detailed Instructions: In this task, you are given a context, a subject, a relation, and many options. Based on the context, from the options select the object entity that has the given relation with the subject. Answer with text (not indexes).
Problem:Context: An SD40T-2 is a 6-axle diesel-electric locomotive built by General Motors Electro-Motive Division having a 16-cylinder EMD 645E3 diesel engine producing . 312 SD40T-2s were built for North American railroads between April 1974 and July 1980. This locomotive and the SD45T-2 are popularly called tunnel motors, but EMD's term is SD40-2s with "cooling system modifications" because they were designed for better engine cooling in tunnels. The difference between this locomotive and its non-tunnel motor cousin, the SD40-2, are the radiator intakes and radiator fan grills located at the rear of the locomotive. The radiator air intakes in this model were along the deck to allow more fresh, cooler air to enter and less hot exhaust fumes lingering around the tunnel's ceiling. , An EMD GP15AC is a 4 - axle diesel - electric locomotive built by General Motors Electro - Motive Division between November and December 1982 . This locomotive differs from the otherwise identical EMD GP15 - 1 due to Missouri Pacific specifying new AR10 AC alternators instead of rebuilt D32 DC generators . The only external difference between the GP15AC and the GP15 - 1 is a straight side sill ( shared with the EMD GP15T ) not related to the transmission difference . 30 examples of this locomotive model were built for American railroads , with four units built for Venezuela 's IFE ., The EMD 645 family of diesel engines was designed and manufactured by the Electro-Motive Division of General Motors. While the 645 series was intended primarily for locomotive, marine and stationary engine use, one 16-cylinder version powered the 33-19 "Titan" prototype haul truck designed by GM's Terex division., An EMD GP15T is a 4-axle diesel-electric locomotive built by General Motors Electro-Motive Division between October 1982 and April 1983. It was a very close cousin to the GP15-1, but used a turbocharger in order to generate more power from a smaller engine. Power was provided by an 8-cylinder diesel engine that generated , the same as the GP15-1, but with four fewer cylinders. , The EMD GP15-1 is a 4-axle diesel-electric locomotive built by General Motors Electro-Motive Division between June 1976 and March 1982. Intended to provide an alternative to the rebuilding programs that many railroads were applying to their early road switchers, it is generally employed as a yard switcher or light road switcher. This locomotive is powered by a 12-cylinder EMD 645E engine, which generates .
The GP15-1 uses a frame, has a wheelbase of and has a length over couplers of . A total of 310 units were built for American railroads. A number of GP15-1s remain in service today for yard work and light road duty. The radiator section is similar to those found on the EMD SD40T-2 and EMD SD45T-2 "tunnel motors," leading some observers to incorrectly identify the units as such or as GP15Ts, and giving them the nickname "baby tunnel motors"., Subject: emd gp15ac, Relation: powerplant, Options: (A) diesel engine (B) emd 645 (C) radiator
Solution:
emd 645