Patent ID: 7802525

Claim:
A multi-fold door for an enclosed railcar, said multi-fold door comprising: a first panel, a second panel, and a third panel, said first panel being pivotally attached to said second panel at an edge of each panel and said third panel being pivotally attached to said second panel at an edge of each panel, said panels being comprised of a hard foamed plastic core laminated between two sheets of steel; a posterior edge of said first panel being attached to a corner post of an end of an enclosed railcar by hinges that are positioned externally to said enclosed rail car; a primary locking mechanism comprising a moveable rod mounted to an exterior surface of at least one of said panels, a lock receiver mounted to a door header of said enclosed railcar; and a secondary locking mechanism comprising a gathering guide mounted in the approximate center of said door header and a corresponding pin mounted on the exterior of said third panel, a second gathering guide mounted in the approximate center of an end sill of said railcar and a corresponding pin mounted on the exterior of said third panel.