Grand Theft Auto IV
Tank cars are found around the map's abandoned rail lines, rusted out and useless.
Grand Theft Auto V
Three 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 last is rusted, wrecked white car remiscent of the black car 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.