drawrod

from The Century Dictionary.

• noun A rod by which two draw-bars, or the drawing-gears at the opposite ends of a railroad-car, are joined.
• noun A straight rod with a thread and nut at one end and an eye and thread and nut at the other, used to secure the draw-bar of a sleigh.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Railroad) A rod which unites the drawgear at opposite ends of the car, and bears the pull required to draw the train.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun rail transport A rod which unites the drawgear at opposite ends of the car, and bears the pull required to draw the train.