sentences:  Four working prototypes were built, and a version was in development using Mitsubishi's 6.7 litre, "445AD" powerplant, Japan's first direct injection diesel engine.However, the entire PX33 project was cancelled in 1937 after the government decided to prioritize Mitsubishi's manufacturing capabilities on commercial development of trucks and buses.In 1937, another Japanese company Tokyu Kurogane Kogyo began production of a smaller four-wheel drive car called the Kurogane Type 95.