How can a train run on a curved track if it doesn’t have a steering wheel?

Do trains have steering wheels?

If not,

How does a train turn?

Steering wheel

Is there a surge?

The fear of being dominated by a driving instructor

"Hit left, hit left!" "Go round, go round!"

"Why are you grabbing the steering wheel so hard?!"

actually

Trains don't have steering wheels.

So here comes the question

No steering wheel

The line is so complicated

The train is going so fast

How to control the direction ?

Case 1

Train turning

Inside the train wheels

There is a disc that is slightly larger than the wheel.

The professional term is rim

When you encounter a bend

The wheel rim serves as a guide

Turn the entire train

The train is subjected to centripetal force on a curve.

So the outer rails are higher than the inner rails.

The force analysis is as follows

The existence of F force enables the train to turn

Case 2

I want to change my head

Double cab

Cooperate with the turnout

Easily turn the train around

The head and tail ends of the EMU train can switch directly with each other

As long as the driver runs from the rear to the front of the car

You can complete the "turnaround" work

Early locomotives could not travel in both directions.

The locomotive is very heavy.

It is not easy to complete a 180-degree turn

Usually in places where you need to turn around

By laying out bulb wires, triangle wires or turntables

To solve the U-turn problem

1

Light bulb cord U-turn

The locomotive circles along a circular railway line, and completes a turn after completing one circle. The disadvantage of this method is that the circular line for the locomotive to circle occupies a very large area, which wastes land resources.

Therefore, this line transfer method was the first to be eliminated. It is now difficult to see the actual object. However, its shadow can still be vaguely found on the circular test lines of some railway scientific research institutions.

2

Triangle line U-turn

The locomotive first travels forward from point A to point B (the railway term for the route from A to B is called corner track one), then travels backward from point B to point C (corner track two), and finally travels forward from point C to point A (corner track three), completing a turn.

This steering method is safe and convenient and has been widely used for a long time. Although it occupies less than half the area of ​​a circular line, it still has the problem of wasting land resources .

3

Turntable U-turn

This locomotive steering mode appeared relatively late

The locomotive first drives onto a turntable with tracks

Turntable rotates 180 degrees

Complete a turn

The locomotive can then switch ends and drive.

The advantages are small footprint and time saving

The disadvantage is that the technology is more complicated

Case 3

Speeding up and slowing down

Mainly rely on the "handle"

(Take HXD3D locomotive as an example)

△ Main handle

Responsible for supplying current

Like a combination of a car's gear lever and accelerator

Can control the speed of the train

I feel this is the real "automatic transmission"

△Brake handle

Brake handle

To put it simply

It's for brakes.

(The "handle" responsible for "braking", is it called "handbrake" for short?)

Good brake handle control

Passengers will also feel more stable and comfortable

Case 4

avoid

If a person or obstacle suddenly appears in front of the train

Sorry

The rails are there, there is no way to avoid them

Emergency braking also has a long buffer distance

therefore

Cherish your life and don't go on the railway

That's it for today

Right now

Do you feel like you have become more knowledgeable?