Rail car door linkage

A door linkage for a side dump railway car comprising in combination:

• a main frame carried on wheeled trucks and having pivot support means on each side thereon;
• a tilting bed resting on said pivot support means, said bed having a car body thereon and at least one side door pivoted at the side thereof;
• a sliding means having first and second ends and adapted to bear against and slide along the underside of said tilting bed at a location on said tilting bed that moves upward during tilting of said tilting bed;
• an extension portion on the bottom of said side door below the point at which the side door pivots on the tilting bed pivotally connected to said sliding means at the first end of said sliding means by a first pivotal connection;
• a linkage arm having first and second ends;
• linkage support means extending out from said main frame on the side of the car opposite from said side door, said linkage support means pivotally connected at its outboard end to the first end of said linkage arm by a second pivotal connection;
• and
• third pivotal connection means between the second end of said sliding means and the second end of said linkage arm.