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Sir Topham Hatt owns a blue car featured in the television series, based on the one that he used in "Troublesome Engines". He uses it to go to places when the engines are busy, or to go see what the engines are doing. It once caused trouble when he drove it into a pothole, but he thinks it very reliable, and wouldn't want to get to work in any other vehicle.
Despite its usual blue colour, the car has taken on many forms throughout the years. It was blue in the Railway Series, but consisted of three different models in the television series. In jigsaws and other merchandise, the car is yellow, except for one where it is red. The plausible explanation is that the Fat Controller has more than one car.
In all cases, his car is presented as a typical vehicle of the 1940s.