Why can't the subway take pictures?

There has been a lot of controversy about whether it is possible to take pictures in subway stations. There are two prominent reasons for the staff to stop photographers from taking pictures. Can these two reasons be established? Let's eat steak together.

A netizen was reminded by the platform staff that he couldn't take photos while taking photos in the subway. The staff said there was a rule against taking pictures. After inquiring about the Regulations on the Administration of Rail Transit in this city, it is found that there are no regulations related to taking photos. The explanation given by the subway company is: "At present, there is really no sign of' No Photographing' in the subway station. On the one hand, because there are many other guiding signs in the subway station, they were not set when we visited other domestic counterparts. Another reason is that subway facilities belong to civil air defense facilities, and civil air defense facilities have confidentiality requirements, so in principle, it is not allowed to take pictures in subway stations. "

Civil air defense facilities need to be kept secret, and the explanation of prohibiting taking pictures is a bit far-fetched. The first subway in China, Beijing Metro 1 Line, was originally built for military strategic combat readiness and air defense! It is understandable that some secrets are involved, but the subway under construction is mainly to alleviate the traffic congestion on the road. Where there are many people, build them first. It has no military strategic defense at all. Another point is that the subway is now a public area, and anyone can enter and exit freely after buying a ticket, and it can be kept secret without taking pictures.

Another reason for not taking pictures is that the flashing of camera flash on the platform will interfere with the driver's observation signal indication and platform situation when the train enters the station. According to my five-year experience as a driver in the subway company, it is quite reliable. Let's do a simple calculation. We know that the speed of a train entering the station is generally 40 km/h, and kilometers are converted into meters, and hours are converted into seconds, which is 40,000 m/3,600 seconds. Then the train will advance about 1 1 m (40000 m ÷3600 s ≈1/m) per second on average. When taking pictures on the platform, the flash will cause the driver to be blind for about 3 seconds. When the driver enters the station, he can't see anything at the 33 meters where the train has passed. Except for slowing down, he must have 20 meters to see it completely. Especially when overhead line passengers can invade the rail transit area at will. The length of the platform of 6 trains is about120m, and this invisible 20m is equivalent to one sixth of the platform. Think about it and you will know how horrible it is.

A friend once asked me if I could take pictures in the subway station, and I gave him the answer, provided that you turn off the flash of the camera and don't care about the safety of others for your personal interests. So turn off your camera flash before taking pictures at the subway station.