1. In a device for use in preparing a draft rigging for removal from or insertion into a draft pocket of a railroad car, wherein the rigging is adapted to be mounted in associated car framing and comprises a draft gear and a yoke encircling said draft gear, with the yoke including a closed rear end abutting the inner end of the draft gear, a forward open end into which the car coupler shank extends in its operative position for keying to the yoke and for cooperation with a front follower received between the draft gear outer end and the yoke open end, and a pair of spaced apart parallel straps connecting said yoke ends, said device being applicable to the rigging when the latter is free of its coupler and the car carrier iron supporting the rigging, and comprising: a frame including a rigid elongate base portion, a pair of arms upstanding from said base portion in spaced apart coplanar relation and defining upstanding ends spaced to receive between them the rigging draft gear, yoke, and front follower in the assembled relation thereof, with one of said arms engaging the yoke closed end on the exterior side of same, and the other of said arms disposed adjacent and in front of the yoke open end, and said base portion paralleling the yoke straps, said one arm being fixed against movement relative to said frame base portion, said ends of said arms and said base portion being in coplanar relation, said other arm being mounted intermediate its ends for swinging movement of its upstanding end about an axis extending substantially normally of the plane of said arms, force applying means carried by said frame for applying force to said other arm to swing the upstanding end thereof toward said one arm, said base portion defining an upper surface formed between said arms for closely receiving the yoke therebetween, said other arm axis being adjacent the level of said base portion surface, said base portion being of generally channelshaped in transverse cross-sectional configuration including a web, that defines said surface, and spaced flanges projecting oppositely of said upstanding ends of said arms, said base portion including adjacent the other end of said other arm and underlying said web and between said flanges a receptacle structure opening in the direction of said other arm other end, and including a hydraulic ram mechanism seated in said receptacle structure for engagement with said other arm other end and acting in a direction substanTially paralleling said base portion surface, with said ram mechanism comprising said force applying means, and means for actuating said ram mechanism from a position remote from said ram mechanism, including a source of hydraulic pressure liquid connected to said ram mechanism, said other arm being mounted to provide a mechanical advantage through which said force applying means acts, and being formed to project into operative relation with the open end of the yoke, free of interference with car framing when the draft rigging is supported by the car framing and said device is positioned to receive the draft rigging between said ends of said arms, whereby, when said device frame is positioned relative to the rigging to dispose said base portion surface adjacent the yoke with the yoke and draft gear between said arms and with said one arm upstanding end abutting the exterior of the yoke closed end and said other arm upstanding end adjacent and aligned with the yoke open end, and with block means interposed between said other arm upstanding end and the front follower at the yoke open end, said force applying means may be actuated to apply force to said other arm to compress the draft gear between the block means and the yoke closed end whereby the closed end of the yoke is utilized to compress the draft gear to the exclusion of the remainder of the yoke.