Grand Theft Auto IV
Tank cars are found around the map's abandoned rail lines, rusted out and useless.
Grand Theft Auto V
Four different Tank cars can be found. The first is an orange car largely unique in design but with a somewhat European influence. This car can commonly be seen being pulled by freight trains.
The second is a black car based on the standard North American DOT-111 tank car. This car can be found as a static object in train yards and sidings.
The third is a white car identical in design to the black car but is instead painted white. This car can only be found as a static object in train yards.
The last is a rusty wrecked car remiscent of the two previous cars but much older and slightly larger in appearance. It can be found as a static object along the abandoned rail line and rail yard in El Burro Heights and in scrapyards across San Andreas.