Why is there a rail with two narrow gauges in the middle?

It is called wheel guard rail, which is to ensure the safety of trains passing through bridges.

As we all know, the rim of the train wheel is on the inside, which is to rely on the power of the rim to ensure that the train runs on the railway. If the train is affected by external factors or internal forces in the operation of violent shaking, it will lead to a major accident of train derailment, and the consequences of accidents on the bridge are unimaginable, so in order to ensure the safety of the train through the bridge, lay the wheel guard rail on the inner side of the rails, even if the train shakes or accidents, the force of the two rails will tightly hold the wheels"Clamp"without accidents such as derailments.

The two narrow gauges in the middle are meant to keep the train safe when crossing the bridge. There are four functions of the guard wheel rail: safety assurance, reducing rail wear, guiding effect and strengthening the structure.

In the movable track fork, the rut fork eliminates the harmful space, so that the running side of the positive line is connected into a straight line, and the role of the wheel guard rail is not reflected, and there is no need to play a role, so the wheel guard rail of the positive line is canceled. And the operation of the siding line because it is a circular curve, so the centrifugal force of the train still exists, so the role of the wheel guard rail is still very important, it can guide and restrict the direction of the wheel, reduce the lateral wear of the rut fork heart rail, play a role in strengthening the structure of the rut fork part, enhance the stability, so the retention of the wheel guard rail on one side of the side of the side line is necessary.

The two lanes in the middle of the long railway are called "bridge rails". It was taken to prevent the train from capsizing over the bridge. Now there are many long bridges on high-speed rail, but there is no such bridge rail, which has better measures to prevent train derailment.

In the middle of the bridge is the guardrail. This is to be able to block the wheels without falling off the bridge in the event of a derailment of the bridge, thus further expanding the accident.

It is a wheel guard, in order to ensure the safety of the defense train through the bridge.

The role of the guardrail is fourfold:

1) Play a role in safety assurance.

2) It plays a role in reducing rail wear.

3) Play a guiding role.

4) Strengthen the structure.

In the movable track fork, the rut fork eliminates the harmful space, so that the working edge of the running of the positive line is connected into a straight line, and the role of the guard rail is not reflected, and there is no need to play a role, so the guard rail of the main line is canceled.

And the operation of the siding line because it is a circular curve, so the centrifugal force of the train still exists, so the role of the guardrail is still very important, it can guide and restrict the direction of the wheel, reduce the lateral wear of the rut fork heart rail, play a role in strengthening the structure of the rut fork part, enhance the stability, so the retention of the guardrail on one side of the sideline is necessary.

The rails in the middle of the rails are called guardrails. It is very close to the outside travel track. It is about the width of a wheel, and it is generally found on bridges, curves, turnouts, etc. It works with the basic track to clamp the train wheels tightly, eliminating any possibility of train derailment.

The general guardrail is divided into bridge guardrail, curve guardrail, and turnout guardrail.

The bridge guardrail can not only avoid train derailment, but also protect the bridge from being hit by derailed trains.

The curve guardrail is to protect the train from derailing due to centrifugal force when the high-speed cornering is derailed.

The turnout guardrail is set up to eliminate the derailment caused by the elimination of the harmful space in the middle of the track during the lane change process.

It's a wheel guard. It is used to prevent train derailment or to avoid serious consequences from derailment.

There are two main categories with different roles:

1。Sharp curve anti-off line single (double) side guardrail, this kind of guardrail is generally more common in subways with high line type difference and speed, and the national railway is basically not seen except for turnouts. This type of guardrail works by restricting the axle traverse by compacting the inside of the wheel, preventing the opposite wheel from climbing and derailing.

The characteristic is that the height of the whole guardrail rail is slightly higher than the basic rail, and the outer side of the guardrail is close to the inner distance of the basic rail, and its width cannot accommodate the thickness of a wheel, and the whole guardrail is directly connected with a large number of screws of the basic rail.

2。Protective guardrails are used for bridges and other areas, which are the most common on the national railway, and rare for subways. The function is that when the train derails, the wheels that fall on the inner side of the basic rail are restricted from continuing to move laterally, so that the train does not overturn in the sensitive section.

Features, compared with the first kind, they are fixed on the sleeper and the basic rail without any directly connected fixed link, the guardrail rail surface is generally not higher than the basic rail surface, the outer side of the guardrail is far away from the inner side of the basic rail, and its width is enough to accommodate the thickness of a wheel.

To sum up, the first belongs to prevention before it happens, and the second belongs to remedial the dead, which is very different in nature.

All the trunk lines of China's national railways are quasi-gauge 1435mm railways, and only the Kunhe line is a narrow-gauge 1000mm railway, because it is necessary to connect with South Asian countries, and the narrow-gauge railways are convenient, and the goods can be changed in China.

Kunhe Line: The Yunnan section has a total length of 468km.

In addition, some of the local railways and forest railways are 762mm narrow tracks, such as the Henan local railway, Yudan Railway, Chaoqi Railway, vertical railway, etc. In addition, there were also Guangdong Mellon Railway and Yunfu Liudu Railway. It is mostly 762mm.

Forest railways are mostly distributed in Northeast China, Inner Mongolia and other forest production areas. There used to be Weihe Forest Iron (Binsui Railway Branch), Jiangxi Gannan Forest Railway, etc. Some of them are now being converted into tourist routes or used for other purposes.

There is no broad gauge on China's trunk lines and branch lines, only Suifenhe, Erenhot and other border stations, and there is a small section of 1520mm wide gauge yard in the station or on the special line, which is convenient for the reloading of goods.

Hello! In layman's terms, it is because the train is in the process of driving, the wheels and tracks are normal and walking, and the wheels and tracks are normally connected, so they will not turn over. Just like driving, those vehicles that follow the traffic rules are very safe.

2020 auspicious.

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