| 摘要 |
A cleaning bullet for use in a track can include a compressible body to clean the track, and a motorized device to propel the body through the track. In some embodiments, the motorized device includes wheels rotatably coupled to the device, a motor to drive the wheels, and a power source to supply power to the motor. Also, in some embodiments, one or more wheels engage an inner or outer surface of the track to move the motorized device along the track. |
