Head end power is the electrical power distribution system used in passenger trains
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Caltrans leased an additional four bilevel coaches from Chicago's Regional Transportation Authority but these could not be used because they required head end power (HEP) for heating and the SP's locomotives used steam heat, which was not compatible.
These vans were fitted with either a small platform-mounted generator to supply 240 V power, or a larger generator in one of the LM modules to supply the 240 V and also power for the air conditioning.
AC traction systems, prime movers, head end power equipment, and computer systems are supplied by GE, while MPI supplies the brake systems, air systems, and cooling systems.
The PL42 has 800 kilowatts head-end power and WABCO's EPIC II braking system, along with an E-7 wheel slide device, made by Wabtec, preventing flats spots on the wheels through software and hardware.