The utility cart is a pushable weapon in Dead Rising 2 and Dead Rising 2: Case Zero. Running the cart into a curb or any other non-zombie obstacle will result in Chuck losing his grip on it, prompting the option to lift the cart above his head.
Chuck finds one of these at the Quarantine Zone in Still Creek, and uses it to move the body of a broken bike back to the gas station where he is holed up.
The cart is unbreakable and can be pushed endlessly to run down zombies for the Zombie Exterminator achievement.
Carts can be found all around Fortune City, sometimes coupled with a push broom. Unlike the one found in Case Zero, they will deteriorate and eventually break after continued use against zombies.