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NYC Transit's newest bus is not only environmentally friendly, it appears to be smiling.

The ECO Saver IV is a hybrid electric 42-footer that's much quieter and has lower emissions than other buses, reducing both noise and air pollution.

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The DesignLine Hybrid is a series hybrid. This means that there is only one connection to the drive train system. This connection is in the form of an electric motor. The electric motor gets its power from the batteries, via an inverter, and the batteries get their power from an APU.

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