L9 for Transit BusThe Cummins L9 diesel engine delivers outstanding productivity with the best power-to-weight ratio in its class.
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Diesel powers over 90% of all school buses thanks to its combination of fuel safety, energy efficiency, reliability, durability, established fueling and maintenance network, range and operational flexibility, secondary markets and low acquisition and operating costs.
Propulsion. The most common power source since the 1920s has been the diesel engine. Early buses, known as trolleybuses, were powered by electricity supplied from overhead lines.
School busses are based on diesel or gasoline internal combustion engines for the most part and have 12VDC (or maybe 24VDC as used in larger trucks) systems for starter and lighting.
The de-rated Cummins L10 engines delivers 180-Hp. Current London d/d buses are powered by a variety of engines such as the Cummins 6.7-litre 6BTA and the Volvo 7-litre engines, with diesel-electric (with battery) and the BYD battery-electric buses now entering service.