The T4 saloon was Rover's their fourth and last prototype road-going turbine car and based on the 2000 prototype and was unveiled two years before the conventional 2000 production model actually reached the market. The 2S/140 turbine engine drives the front wheels and rear suspension is independent with swing axles. Kerosene consumption is in the range of 16-20 miles per gallon.

Rover claimed that the T4 could be produced in three years if the market was ready to accept it, at a price of £3,000-4,000. The most expensive Rover in production at the time cost £1,948. In fact, Rover had already abandoned any hope of putting a turbine engine car into production.