[ flat-kahr ]
/ ˈflætˌkɑr /
a railroad car consisting of a platform without sides or top.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for flatcar
Thereupon they threw a line about the shack and with the engine hauled it to the side of a flatcar attached to the train.Roosevelt in the Bad Lands|H. Hagedorn.