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|In 1933, Reid Railton strapped a plane engine to the most rudimentary chassis he could, and the Napier-Railton was born.|
This missile on wheels broke all kinds of records in the few years after that, most notably the all-time lap record at the Brooklands oval in England, which it held until the oval was repurposed for military use at the onset of World War II.
The Napier-Railton gets its name from its creator, Reid Railton, as well as its engine, a 24-liter W12 Napier airplane engine, the most powerful engine available at the time it was built. It’s a truly one-of-its-kind vehicle.
— Official description 
Unlock in Forza Horizon 4
It is unlockable as a Hard-to-Find car.
- "Cult Courier" Season Event - Series 20 Autumn Season
The Napier-Railton is an aircraft engine powered race car known for breaking world speed records, most notably on the historic Brooklands race track, where it ran 143 mph (230 km/h).
The 24 liter Napier Lion engine uses twelve cylinders on three banks aligned in a W layout, hence creating the W12 configuration and using a triple exhaust system. This layout gave it shorter dimensions than contemporary V12 aircraft engines.
Boasting 564 hp (421 kW) and an imposing torque output of 1249 ft·lb (1693 N·m), the Napier-Railton is the most powerful pre-war car in the Forza series. Its engine is mated to a three-speed non-synchronous transmission.
The Napier-Railton has a riveted bare aluminum body similar to aircrafts. It uses leaf springs on both axles, with the rear notably using two sets of cantilever leaf springs on each wheel. As the front is not fitted with brakes, the car solely brakes with 16 inch rear drum brakes.
Weighing 4518 lb (2049 kg), the Napier-Railton is one of the heaviest pre-war cars in the Forza series.
|Speed 7.1||Handling 5.1||Acceleration 5.3||Launch 6.8||Braking 5.6||B 628|
|Unlockable as seasonal reward or from an Auction House purchase||Value: 1,000,000 CR|
|Top Speed: missing data||Championship: Vintage Racers|
|Acceleration 0-60 mph (0-97 km/h): missing data||0-100 mph (0-161 km/h): missing data|
|Braking 60-0 mph (97-0 km/h): missing data||100-0 mph (161-0 km/h): missing data|
|Lateral G's 60 mph (97 km/h): missing data||120 mph (193 km/h): missing data|
|Conversion - Drivetrain|
- This car has the biggest engine displacement out of any car featured in the series, overall, and out of all naturally aspirated cars, at 24 liters.
- ↑ "Forza Horizon 4 | Series 20 Update". forzamotorsport.net. Retrieved 03-12-2020.
- ↑ "Cobb Napier-Railton Endurance Racer". oldmachinepress.com. Retrieved 03-13-2020.