Transit Bus
A heavy-duty bus operated in scheduled public transit service. Built for very high mileage, constant stop-start duty and a long service life.
A transit bus is engineered for a duty cycle almost nothing else in a public fleet shares: continuous service, frequent stops, heavy passenger loads and very high annual mileage over a service life measured in more than a decade.
Transit fleets are usually funded and reported differently from the rest of a jurisdiction fleet. Federal transit funding brings requirements around asset condition, useful life and reporting, so a transit fleet often sits under a separate management and capital regime even where the same shop turns the wrenches. Whether a given rule applies is a question for the agency transit program rather than a general answer.
The maintenance consequence is scale and cadence. Doors, wheelchair ramps, air systems, fareboxes and passenger seating are high-touch components that fail from use rather than age, and a transit PM interval is short and unforgiving compared with the rest of the fleet.
Transit has also been among the first parts of public fleet to electrify at scale, which is why transit depots are often where a jurisdiction learns what charging infrastructure really costs.