Vehicle is a general term for "vehicle" and its unit "vehicle". The so-called car refers to a means of transportation that rotates with wheels on land; The so-called car comes from the ancient method of measuring cars. At that time, cars usually had two wheels, so they were called one or two when they were taken, and then they were written as cars.
It can be seen that the original meaning of a vehicle refers to a car that has no power itself. Horses drawn by horses are called carriages, and rickshaws are pulled or pushed by people. With the development of science and technology, there are cars pulled by steam engines and so on.
At this time, the concept of vehicles has quietly changed, becoming a general term for all vehicles. For example, the number of urban vehicles counted by the traffic management department and the number of vehicle traffic accidents reported by newspapers and periodicals. Vehicles here refer to all cars.
However, the vehicles mentioned on the railway still refer to passenger and freight transport vehicles that can only run on the railway line by locomotive traction without power plant.