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A transport refrigeration system having a frame which supports a refrigerant compressor, a prime mover for the compressor, condenser and evaporator coils, and an air delivery assembly for moving air through the condenser and evaporator coils. The air delivery assembly includes a single shaft having

A transport refrigeration system having a frame which supports a refrigerant compressor, a prime mover for the compressor, condenser and evaporator coils, and an air delivery assembly for moving air through the condenser and evaporator coils. The air delivery assembly includes a single shaft having first and second condenser blowers mounted adjacent the ends of the shaft, and an evaporator blower mounted on the shaft between the first and second condenser blowers. A drive arrangement for the air delivery assembly includes a jack shaft between the shaft of the air delivery assembly and the prime mover, with the prime mover being linked to drive the jack shaft, and with the jack shaft being linked to drive the shaft of the air delivery assembly.

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A transport refrigeration system adapted for mounting on the front wall of a trailer, including a frame supporting a refrigerant compressor, a condenser coil assembly, an evaporator coil assembly, a air delivery assembly, and a prime mover assembly for driving the compressor, characterized by: the a

A transport refrigeration system adapted for mounting on the front wall of a trailer, including a frame supporting a refrigerant compressor, a condenser coil assembly, an evaporator coil assembly, a air delivery assembly, and a prime mover assembly for driving the compressor, characterized by: the air delivery assembly including first, second and third blowers mounted on a first shaft, with the first and third blowers being condenser blowers arranged to provide air flow through the condenser coil assembly, and with the second blower, which is disposed intermediate the first and third blowers, being an evaporator blower arranged to provide air flow through the evaporator coil assembly, a jack shaft spaced from said first shaft, means operatively linking said first shaft and said jack shaft, and means operatively linking the prime mover arrangement and said jack shaft, said prime mover assembly including an internal combustion engine, an electric motor, and clutch means, said means which operatively links the prime mover assembly and the jack shaft including first and second pulleys on the electric motor and the jack shaft, respectively, and belt means linking the fist and second pulleys, wherein the electric motor directly drives the jack shaft when the motor is energized, and, when the electric motor is de-energized and the engine is operative, the engine directly drives the compressor via the clutch means and the engine drives the jack shaft via the de-energized electric motor.