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- The SD45T-2 is a model of diesel-electric locomotive built by EMD for the Southern Pacific Railroad. Like the later SD40T-2 it is colloquially nicknamed a tunnel motor. 247 total units (including the original EMD/SP joint venture working Prototype) were produced from February 1972 to June 1975, including 84 for SP's subsidiary Cotton Belt. From April 1986 to December 1989, 126 were rebuilt and re-designated as SD45T-2R, including 24 for Cotton Belt. The SD45T-2 is a variant of the venerable SD45 that featured the "Dash 2" upgrade components such as improved electronics and high traction trucks, with the "T" denoting its cooling system modifications. The intake for radiator cooling air was moved to the walkway level and the cooling fans themselves were under the radiator cores, instead of above. Tunnel motors were built for mountainous areas in the western United States, where SP had previously encountered repeated overheating issues on their SD45s. The later SD40T-2 looks similar to the SD45T-2. One spotting difference is the longer hood on the SD45T-2 to accommodate the V20 prime mover vs. the V16 used on the SD40T-2. The SD45T-2's cab is further forward on the frame, so there is less "front porch". This mimics the differences between the SD45-2 and the SD40-2. Another spotting difference is the SD45T-2's three fan access doors on each side above the cooling air intake, while the SD40T-2 has two. Like their SD40T-2, some of SP's SD45T-2 tunnel motors were obtained by Kansas City Southern Railway, Bessemer and Lake Erie Railroad, Duluth, Missabe and Iron Range Railway, and by the Union Pacific Railroad when it merged the SP in 1996. Some SD45T-2s were rebuilt and designated to SD45T-3, SD40T-3 and SD40-2T. In addition, some locomotive leasing companies own the SD45 tunnel motor locomotives. They are scattered all over the United States and are an increasingly rare sight. (en)
- SD45T-2型柴油机车是美国通用汽车易安迪公司（GM-EMD）在1972年推出的一款电力传动柴油机车，属于易安迪Dash 2系列柴油机车产品之一。该型机车是在SD45-2型柴油机车的基础上，针对在美国西部运用的机车在夏季通过长隧道时、冷却系统散热能力明显不足的问题，由易安迪公司和南太平洋铁路合作改进设计而成。1972年2月至1975年6月，易安迪公司制造了247台SD45T-2型柴油机车，全部交付南太平洋铁路及其子公司使用。与其兄弟车型SD40T-2型柴油机车一样，南太平洋铁路拥有的部分SD45T-2型柴油机车后来被转手至堪萨斯城南方铁路、、、联合太平洋铁路。 SD45T-2型柴油机车是干线货运用的六轴柴油机车，采用单司机室、底架承载结构、双侧外走廊的罩式车体，车体上部自前向后由电气室、司机室、动力室、冷却室四部分组成，其中电气室一端称为短罩端，动力室和冷却室一端称为长罩端。与SD45-2型柴油机车相比，SD45T-2型柴油机车的车体底架延长了22英寸，并相应加大了散热器和进风口面积。机车走行部为两台易安迪，主要特点包括具有较大刚度的橡胶摇枕弹簧二系悬挂装置、牵引电动机顺置布置、大直径心盘及低位牵引装置等，具有充分利用最大的粘着重量、降低、提高牵引能力的优点。动力装置为一台3600马力的20-645E3型柴油机，这是一款、二冲程、水冷式、涡轮增压的V型柴油机，气缸直径为9-1/16英寸（230.2毫米），活塞行程为10英寸（254毫米），额定最高转速为每分钟900转。传动系统采用交—直流电传动，柴油机输出轴通过联轴器驱动一台AR10型交流发电机，发出的交流电通过大功率硅整流装置转换为直流电，然后供给六台D77型直流牵引电动机。牵引电动机采用轴悬式驱动方式，牵引齿轮传动比为4.13（62：15）。机车设有恒功率励磁调节系统和模块化电子控制系统。 (zh)
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- 20 (xsd:nonNegativeInteger)
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- 247 (xsd:nonNegativeInteger)
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- 5330 (xsd:nonNegativeInteger)
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- February 1972 – June 1975 (en)
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| dbp:caption
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- Indiana and Ohio Railroad #4504, still in Southern Pacific colors (en)
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- many still in service as of 2010; one donated to California State Railroad Museum (en)
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| dbp:enginetype
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| rdfs:comment
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- The SD45T-2 is a model of diesel-electric locomotive built by EMD for the Southern Pacific Railroad. Like the later SD40T-2 it is colloquially nicknamed a tunnel motor. 247 total units (including the original EMD/SP joint venture working Prototype) were produced from February 1972 to June 1975, including 84 for SP's subsidiary Cotton Belt. From April 1986 to December 1989, 126 were rebuilt and re-designated as SD45T-2R, including 24 for Cotton Belt. (en)
- SD45T-2型柴油机车是美国通用汽车易安迪公司（GM-EMD）在1972年推出的一款电力传动柴油机车，属于易安迪Dash 2系列柴油机车产品之一。该型机车是在SD45-2型柴油机车的基础上，针对在美国西部运用的机车在夏季通过长隧道时、冷却系统散热能力明显不足的问题，由易安迪公司和南太平洋铁路合作改进设计而成。1972年2月至1975年6月，易安迪公司制造了247台SD45T-2型柴油机车，全部交付南太平洋铁路及其子公司使用。与其兄弟车型SD40T-2型柴油机车一样，南太平洋铁路拥有的部分SD45T-2型柴油机车后来被转手至堪萨斯城南方铁路、、、联合太平洋铁路。 (zh)
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| rdfs:label
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- EMD SD45T-2 (en)
- SD45T-2型柴油机车 (zh)
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- "tunnel motor" (en)
- EMD SD45T-2 (en)
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