Fisher Body to build the Fisher GTB-40 bus, a 40-foot ultralightweight hybrid that boasts twice the fuel efficiency of current hybrid buses. It uses a lightweight, nitrogen-strengthened stainless steel unibody; has no traditional engine for propulsion; and relies on Swiss-made batteries to drive motors for each wheel. The buses are half the weight of other hybrid and diesel models.
A small diesel engine powers a generator that keeps the batteries charged longer. Energy from the brakes is captured for reuse. Automotive News