For example, a New Flyer DE40LFR is a 40-foot (nominal) rigid Low Floor (Restyled) with diesel-electric hybrid power.

A B85 was sent to the United States for testing in 1988, and New Flyer subsequently developed and launched the Low Floor series with the D40LF, which began production in 1991 at the Grand Forks assembly plant.

The ISE ThunderVolt system is modular, with several primary subsystems including a diesel, gasoline, or hydrogen-fueled auxiliary power unit (APU), traction motors and gearbox (supplied by Siemens under the ELFA brand), and energy storage (using either batteries or ultracapacitors).

Although most agencies responded by pursuing natural gas-powered buses, Long Beach Transit (LBT) conducted a cost analysis that concluded a gasoline-electric hybrid could meet emissions requirements and also be cost-effective.

[11] This prototype, designated HE40LF, was equipped with the ISE ThunderVolt series hybrid powertrain, using a Ford 6.8L V10 internal combustion engine modified to run on hydrogen, which was in turn coupled to a generator to provide energy for the traction motor and storage battery.

[15] Omnitrans, serving the city of San Bernardino, was the lead agency for the ISE ThunderVolt gasoline-electric hybrid powertrain deployed in the GE40LF.

[16] Omnitrans procured two of the three testing prototypes; Long Beach Transit placed the first large-volume regular production order.