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Current Diesel electric trains could be replaced with hydraulic in wheel drives. Today a Diesel electric train uses the drive motors to heat a grid above the engine for braking. With the surge recovery capability of a hydraulic drive they could use an accumulator to recover that wasted heat energy.
Kind of like a giant electric stove.
Accumulator cars could be added for areas with steep grades, instead of adding engine units.
regards
Mech
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