What is the initial letter of bullet train?

Motor train: d

Intercity: c

Fast (air conditioning fast): k

Express: t

Direct delivery: z

Tourist train: y

The beginning of n used to refer to the through train in the pipeline, but now it has been cancelled and changed to K+4 digits.

Extended data:

Motor train, full name of power vehicle, has cold type and intercity type. Refers to the vehicles equipped with power devices in the rail transit system, including locomotives and power cars. Motor vehicles are equipped with driving wheels, and the corresponding vehicles without driving devices are trailers. If the train can run normally on the track, there must be a moving car to provide enough traction for the whole train, but it is not necessary to hang a trailer without power.

EMU is a railway vehicle equipped with wheel-driven mechanical equipment, not an EMU. Not only high-speed trains have bullet trains, but all types of vehicles, including constant-speed EMUs, ordinary-speed trains, subway trains, light rail trains, monorails and maglev trains, have bullet trains.

EMU generally refers to a rail vehicle that carries running load and has its own power; But in modern EMUs, EMUs are closer to the role of locomotives in traditional trains, and generally do not carry operating loads. In China, trains with a speed of 200 and above and using CRH Harmony are called "EMU".

China's EMU trains are divided into three grades: high-speed EMU (speed 250 and above, marked G, mainly corresponding to high-speed railway), and unlimited speed limit; Ordinary EMUs or medium-speed EMUs (No.D, speed 160 and 200 km, mainly corresponding to fast railways) and low-speed EMUs (CSR Qingdao Company delayed its technical capability and studied the speed 140 km to adapt to urban light rail).

In application, bullet trains are much more flexible than trains. Although there are not many passengers at a time, the trains can be arranged more closely. When there are many passengers, one or more light unpowered trailers, that is, light passenger cars, can be attached to the high-power train. Due to the expansion of the scope of use and the increase of passengers, EMU has gradually developed into a widely used EMU in the world. Railway transport vehicles carrying passengers, luggage and parcels are equipped with their own propulsion devices.

According to the driving mode, motor trains can be divided into gasoline motor trains driven by gasoline engines, diesel motor trains driven by diesel engines and electric motor trains driven by electricity. The power transmission mode can be mechanical transmission, hydraulic transmission or electric transmission.

When more than two motor cars or high-power motor cars pay attention to one or more trailers, the EMU can improve the passenger and cargo loading capacity and transportation efficiency. Compared with railway trains, railway bullet trains are characterized by strong flexibility and small passenger capacity, but the number of trains can be increased, so many countries attach importance to them and gradually develop into a widely used means of transportation.

Power devices are installed on each carriage in a scattered way, so that both traction and passengers can be carried. This kind of bus is called a bullet train. EMU consists of several self-powered vehicles and several unpowered vehicles. Powered vehicles are called motor trains, and unpowered vehicles are called trailer groups. EMU technology originated from subway, which is a kind of power dispersion technology.

Under normal circumstances, the ordinary train we take depends on locomotive traction, and the carriage itself has no power, which belongs to power concentration technology. On the other hand, trains with "multiple units" have their own power. When running, both the locomotive drive and the "self-running" make the power dispersed and achieve high-speed effect.

As a modern means of transportation suitable for short and medium-distance railway passenger transport, EMU can be divided into many types: EMU and diesel EMU according to transmission type; According to the form of power, it can be divided into centralized power and decentralized power; According to the transmission mode, it can be divided into electric transmission and hydraulic transmission.

Because the EMU can be flexibly grouped according to the passenger flow change of a certain line, it can realize the high-density small group departure, which has the advantages of good safety performance, large capacity, no need to turn around when going back and forth, little pollution, energy saving and self-power supply. It is favored by domestic and foreign markets and is known as the "new darling" of transportation in 2 1 century.

Generally, diesel multiple units have trains at both ends, and some have passenger rooms. This is the common EMU in China, such as Shenzhou, Sifang, Tangshan, Qicheng and Changke EMUs. EMU is divided into centralized and decentralized, and DDJ 1 and Blue Arrow were centralized two years ago. Spring City and the Star of the Central Plains are scattered.

Generally speaking, EMU should be jointly developed by bus manufacturers, users and factories or research institutes.

References:

Baidu encyclopedia-bullet train