If the bullet train and the general express are both electric powered, why is the speed difference s

The difference in speed is mainly a matter of the body of the track for traction.

The EMU is streamlined and has high downforce, which can pass beyond the speed limit of the normal speed train in areas with low track speed limits.

For example, the construction speed limit of the Guojiadian line of the Beijing-Harbin line, the speed limit of the general speed train is 60, and the speed limit of the bullet train is 80).

The bogie (wheel) of the ordinary car body, the structural speed limit is 100 (209 type), 140, 160, 200 and other levels, the maximum speed limit of the whole train is subject to the lowest structural speed limit (just like the barrel principle), and the speed limit of the EMU bogie is above 350.

There are also restrictions on the wagons of a normal car body, which is analogous to a bogie.

An ordinary electric locomotive can run more than 200km h, but it can't run 170km h when a whole train is pulled

Imagine the difference between riding a horse and riding a carriage).

The EMU is equivalent to a multi-car locomotive running according to the unified instructions, which is relatively not too much traction burden, and naturally runs fast.

There are also general bullet trains have passenger dedicated lines, there are no trucks and other slow cars running, basically not involving waiting for the car in front, running fast, even if it is running the existing line of the train, he is basically an express class of cars before and after. There is no slow train pressing. The ordinary speed train is mixed with passengers and goods, and the pressure of the front car is serious, and it will be rear-ended when it runs fast.

Each carriage of the bullet train is powered, and the general express is only pulled by the locomotive. Which do you say is fast.

What was said upstairs was. Compared with diesel locomotives, the acceleration of electric locomotives is a grade higher, that is, electric locomotives generally accelerate faster than diesel locomotives.

Specifically, it also depends on what type of electric locomotive it is. In general, passenger electric locomotives will accelerate faster than freight electric locomotives. Because the acceleration is fast, the normal speed can be reached quickly, which saves time for passengers.

The models of electric locomotives with faster acceleration are: SS8 (fast when pulling short marshalling within 10 knots.) If it exceeds 10 knots, it will accelerate slowly), HXD series locomotives (all the following models are common to passengers and freight).

Freight electric locomotives generally accelerate more slowly because the weight of the wagons is there. However, when a freight locomotive pulls a passenger car, the speed is also fast because of its large traction.

The acceleration performance of the electric motor is better than that of the internal combustion engine

Electric cars are powered by batteries, which are limited in size and weight, and the voltage, power, and power of the batteries are limited, so they cannot provide high speeds.

The power used by the high-speed rail traction station is 220kV AC high-voltage electricity, which becomes direct current to supply power to the locomotive after rectification and voltage reduction, with a power of tens of thousands of kilowatts, and the friction resistance of the train track is also less than that of the car, so the speed is faster.

In the future, electric cars will not be able to replace locomotives even if their speed and endurance are improved, because considering the safety, cars cannot be too fast on the road, and the carrying capacity of electric locomotives cannot be replaced by cars. At most, electric sedans will replace internal combustion cars.

High-speed rail has a fixed track, and the friction with the track is basically 0, how to use good electricity for cars, there is still relatively large friction, which is difficult to compare with high-speed rail, but there is still a little hidden danger in the safety of high-speed rail.

High-speed rail uses magnetic levitation technology, of course, fast, electric vehicles can now reach 80-90, but the number of batteries is too huge, the future trend is difficult to say, to solve the gasoline problem, the battery problem is difficult to solve,