stock car 
noun
1An ordinary car that has been strengthened for use in a type of race in which competing cars collide with each other: [as modifier]: stock-car racing...
- He soon began drag racing at local tracks and competing in oval-track stock-car events.
- For Montreal motorists and taxi commuters, it's like a miniature stock-car race on a city street.
- The stock-car races slide across the compass, lurch with a crunch and glass breaking up against the end of the street, burglars are picked out in light on the doorsteps, even primroses glow, and the wing cases of dazed beetles.
2North American A railway wagon for transporting livestock.Surrounding the depot on the former Silverton house tracks is a large assortment of D&RGW rolling stock, including stock cars, box cars and a veritable fleet of drop-bottom gons....
- Annual report statistics failed to identify fully all forms of livestock being shipped in stock cars.
- More hay was part of this hospitality, and a horse and cart distributed supplies up and down the galleries alongside these stock cars.