Cleaning System

A cleaning system comprising:

• a travel rail forming a transport path for an article transport vehicle;
• and
• a cleaning vehicle capable of traveling on the travel rail, and
• wherein:
• the travel rail comprises a right rail on which a right wheel of the article transport vehicle rolls and a left rail on which a left wheel of the article transport vehicle rolls,
• the cleaning vehicle comprises:
• a right suction port disposed to oppose a rolling surface of the right rail;
• a left suction port disposed to oppose a rolling surface of the left rail;
• a negative pressure generation unit that is shared by the right suction port and the left suction port, and is configured to generate negative pressure;
• a right flow path connecting the right suction port and the negative pressure generation unit;
• a left flow path connecting the left suction port and the negative pressure generation unit;
• and
• a communication state changing device configured to change a communication state of each of the right flow path and the left flow path, and
• the communication state changing device is configured to be able to switch between
• a both-sides communication state in which both the right flow path and the left flow path are in communication,
• a right-side communication state in which the right flow path is in communication and the left flow path is blocked, and
• a left-side communication state in which the left flow path is in communication and the right flow path is blocked.