Escort vehicles in the Police Convoy are two separate 1955 Chrysler Imperials 4 door Sedans. They were powered by Chrysler's first generation "Firepower" Hemi V8 engine, which displaced 331 cu.in. and rated at 250hp. This is the first generation of the new Imperial (1955-1956) after spinning off from Chrysler Corporation as its own separate brand and division. It now belonged to the new Imperial Division of Chrysler Corporation.