A bus garage, also known as a bus depot, bus base or bus barn, is a facility where are stored and maintained. In many conurbations, bus garages are on the site of former or tram sheds, where (streetcars) were stored, and the operation transferred to buses. In other areas, garages were built to replace horsebus Stable or on virgin sites when populations were not as high as now.
Overnight, the more valuable or regularly in-service buses will usually be stored in the interior of the garage, with less used or older service vehicles, and vehicles withdrawn for storage or awaiting disposal, stored externally. During the day, internal and external areas will see a variety of movements. Heritage vehicles are almost exclusively stored inside the garage.
Often garages will feature rest rooms for drivers assigned to 'as required' duties, whereby they may be required to drive relief or replacement buses in the event of breakdown. The garage may also have 'light duties' drivers, who merely move the buses internally around the garage, often called shunting. Shunter or light duty drivers are often employed in larger depot facilities and work night shifts in order to position buses in the correct order for morning departures from the depot with the first buses due to leave the depot parked logical order nearest the exit. Because they are driving on privately owned land in many jurisdictions a full bus licence may not be required to perform such tasks. In addition they may also perform other tasks such as cleaning buses, refuelling and light maintenance tasks.
Bus garages will generally have large areas unobstructed by supporting columns as well as high roofs, especially for storage of double-decker buses. Recently in London, the transfer of routes from double-decker operation to articulated buses has caused problems at some garages that were found to be too small to accommodate all the replacement buses, requiring splitting of allocations, or the building of new garages.
Some bus companies in the UK make use of outstations (or out-stations) as an additional bus storage facility. These are generally outdoor parking locations, where buses are stored overnight or between peaks, which are more conveniently located for operations, reducing dead mileage. There does not appear to be a universal definition of an outstation, but it seems agreed that there are no maintenance facilities at a bus outstation.
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