Trains are stabled in depots or sidings when not in use and they need to be cleaned and serviced.Cleaning means a regular exterior water wash and interior sweeping and dusting or vacuuming.

• 当列车不使用时，要停放在车辆段或站线上，这些列车需要清洗和维护，清洗就是对列车外表进行水洗，对其内部进行清扫、除尘或吸尘。