Dual-mode bus

A dual-mode bus, also known as a duobus or bimodal bus, is a bus that can operate using two independent power sources. Most commonly, this refers to a vehicle that combines the features of an electric trolleybus, drawing power from overhead lines, and a conventional bus, powered by a diesel engine.

The term is primarily used for buses with two full-fledged, powerful propulsion systems, designed for regular service on routes that are only partially equipped with overhead wires. This distinguishes them from trolleybuses equipped with a small auxiliary power unit (APU), which is only intended for short-distance, low-speed maneuvers such as bypassing obstacles or navigating depots. A separate term, IMC Electric bus (for In-Motion Charging), is used for modern vehicles that combine overhead wire operation with a large battery pack, allowing for significant wireless travel without a fossil fuel engine.

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