[quote]Analysis of 723 crashed a car driver
The article submitted by: qwerasdf2009

The following is an analysis of a train driver, after reading the conclusion is the emergence of the accident may have two reasons: one is man-made, serious dereliction of duty or intentionally damage; two is the braking system of EMU has a problem, that is the brake does not pass. I think the official conclusion is likely to be man-made, shipenzi because in a few people, in short, death can not admit that train has a problem, should be responsible for that too many people.


7.23 accidents will be a mystery. Sorry, sad at the same time I confused.
On July 23rd at eight thirty-seven in the evening
Wenzhou Shuang Yu Xia Ao Road
Beijing to Fuzhou D301 and Hangzhou D3115 Fuzhou rear end, causing 6 carriages.

Know the news, I was on duty, drove the train bridge over the Yellow River. That is the rear end accident completely no idea, confused. Because it didn't happen. Below is my personal analysis.

The first little confused me, a little confused and no technical content will I bothered. Firstly, officials said, because the lightning caused D3115 train lost power to the viaduct on the rear of the oncoming D301 hit up. Lost power? Electric locomotives, electric multiple unit, the power source is the contact network, and the two trains are down train, namely the same orientation and track (such as a different track of course not rear end), then power sources were from the same contact network, there is no reason before the car lost power and the normal operation of the vehicle.

The second point, if the lightning strike destroyed the D3115 train of electrical equipment or low voltage equipment or traction of high-voltage equipment can't cause it properly, the first ATP, now the world advanced CTC vehicle equipment, the equipment to send signals to the rail, train the received signal after computing distance with the vehicle in front and combined with their speed to take the speed limit and other measures, and also can see the train running status position in scheduling table. That is to say if the simple interval non normal parking is not such a tragedy.

The third point, if the lightning strike destroyed the power equipment D3115 train, and ATP is also in the lightning damage can not transmit signal, Is it right? Cannot avoid the accident happened? Of course not. The EMU is installed with CTC ATP, but also all the trains in China are all installed LKJ train operation control system, that is to say the high-tech equipment ATP is higher demand higher standards of fault, it should also be still safe. ATP is the judgment of the train speed intelligent device through the signal before the car emission, while the LKJ is through the signal ground color light signal receiving track circuit to realize safety control of train. That is to say, in the absence of signal D3115 launch of the case, as long as the train wheels on the rail, two tracks will be wheelset short circuit, a circuit is switched on, will make the color light signal machine D3115 before they are shown in red, then yellow, then green, yellow, and green. After the LKJ monitoring device D301 car color light signal receiving color light signal is displayed on the screen, see the yellow light drivers will slow down, the red light will stop. Even if the D301 driver to sleep, LKJ device will automatically take measures such as reducing parking, why?

The fourth point, you will say, that LKJ are malfunctioning. If it is D3115 times the power fault system in the ATP system, at the same time D301 fault monitoring device LKJ, small probability event. Would you say that accidents are coincidence. Wrong, if the power loss of LKJ system in operation, the train will direct the implementation of emergency braking. If the LKJ board fault, will automatically fall to the standby board (LKJ monitoring device is divided into a group and B group, failure in a set of automatically switching the other group). You will say, group AB plug-in board at the same time the fault? If the AB group at the same time, fault, LKJ will enter the 30 seconds, 30 seconds after the train emergency braking. You say 30 seconds is enough to fill a. Wrong, if the train speed, is to receive the yellow light fault, then the fault distance for car should be in the two block section above, at a distance of three km, and the passenger train should be occluded for four displays, and there is a free partition, should be in the four block District entered the countdown, enter the countdown at 5 kilometers away.

The fifth point, the track circuit fault, fault color light signal, and also can't fault. What do you mean? Is the D3115 time short track circuit after the rear should be displayed as red, track circuit and the color light signal machine fault, resulting in D301 LKJ device can not receive the signal, D301 LKJ device will remove the white light, the speed limit is 0km per hour, emergency stop. Now a rear end collision, then the signal display is the only light. The severity of the fault is the track circuit and the color signal, can not display correctly, and must also display, not only to reality must also display for the green light. Track circuit and the color light signal machine fault expresses great pressure.

The sixth point, scheduling problem, D3115 position should be displayed in the scheduling table, tap fault words, will appear red in the scheduling table track circuit, track circuit failure cannot display the words, D3115 time communication equipment GMSR infinite train dispatching telephone and more advanced.

The tragedy happened, hope that the authorities concerned to find out the reason to answer, to the victims, the families of the victims, the people of the whole country, the railway workers a replacement.
Comrade Pan Yiheng D301 train drivers and 7.23 accident has died, the chest is gateway to penetrate. Decisive measures for emergency braking, behind the visitors win a life. We hope relevant parties do not put all the shit urine jar to buckle our head.