Article Storage Facility

An article storage facility comprising:

• a first rail extending along a rail extending direction;
• a first storage rack extending along the first rail and configured to store a plurality of articles;
• a first transport device configured to move along the first rail and to transfer an article to and from the first storage rack;
• a second rail extending along the rail extending direction;
• a second storage rack extending along the second rail and configured to store a plurality of articles;
• and
• a second transport device configured to move along the second rail and to transfer an article to and from the second storage rack;
• wherein the first rail and the second rail are spaced apart by a set distance from each other along the rail extending direction,
• a third rail extending along the rail extending direction between the first rail and the second rail, and having a length less than the set distance,
• wherein the third rail includes a fixed base whose location is fixed with respect to the first rail and the second rail and a movable rail portion capable of being fixed to the fixed base, and
• wherein the movable rail portion is configured such that a location of the movable rail portion with respect to the fixed base when fixed to the fixed base can be changed.