Railway car truck with a rocker seat

A railway car truck comprising:

• a side frame including a central axis, a bottom tension member, a top compression member, first and second spaced apart columns extending between said bottom tension member and said top compression member, and a window located between said bottom tension member and said top compression member and between said first and second columns;
• a transom having a first end, a second end and a central axis, said first end of said transom located within said window of said side frame;
• and
• a rocker connection pivotally supporting said first end of said transom on said bottom tension member of said side frame, said rocker connection including a rocker seat attached to said first end of said transom and a rocker bar removably supported on said bottom tension member of said side frame, said rocker seat including a rocker bearing having a concave bearing surface and a central axis, said central axis of said rocker bearing being perpendicular to said central axis of said transom, said rocker bar including a convex bearing surface adapted to pivotally engage said concave bearing surface of said rocker seat, said convex bearing surface of said rocker bar having a central axis located parallel to said central axis of said side frame;
• whereby the engagement of said rocker with said rocker seat disposes said central axis of said transom perpendicular to said central axis of said side frame, and such that said rocker bar and said side frame are pivotal with respect to said rocker seat and to said transom about said central axis of said rocker bar, and wherein said bottom member of said side frame includes a first opening and a first pocket to adapted to removably receive said rocker bar, and said first column includes a second opening, said first and second openings forming a passageway through said side frame in communication with said window such that said rocker bar can be passed through said passageway and positioned within said first pocket.