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That "Green Goat" is a recently developed hybrid switchyard locomotive used to move small numbers of rail cars around in a switchyard. It would be the railroad equivalent to a mail delivery truck or garbage truck, i.e. traveling short distances with small loads at low speeds with lots of starts and stops. The long haul locomotives and most of the existing switchyard locos are all still non-hybrid diesel-electrics. The challenge is developing a hybrid battery system that can handle the massive number of amps that would required or generated when accelerating or decelerating a 100+ rail car train. Current hybrid technology can handle the demands of a switchyard loco, but is not yet up to managing the energy flows of those mile long freight trains.
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