With the growth of railway lines, a new problem has emerged, that is, the problem of meeting trains, because it is a single-track train, then, there must be a problem of meeting trains.

Throughout the railway line, there will be a number of small stations, and in the small stations there are two parallel railway lines. Some will be three or more railways, these extra railways, not much longer is some forks, in order to allow the train to stop when the train, and some places will have a platform at one end, this platform is for the carriage and ox cart to catch up with the train directly, this is the loading fork.

In the beginning, when the line was short, because there were few trains, this was not a particularly important problem, as the line grew, the number of trains began to increase, and even the vehicles used to build the road increased, and now there are several trains running at the same time to transport stones and rail sleepers.

As mentioned earlier, the telegraph can make a prompt for the railway signal, however, it also needs a special design to make the signal work normally, and even, Yang Heng also needs to make the turnout work normal or not, whether it is in place, there must be a special display, so that there will be a special indication signal in the two places where the car is parked, and there will be a special duty personnel to control these signals, which requires special training for these duty personnel, in fact, the signal is very simple, and the duty personnel must be quite conscientious, otherwise, No matter how good the signal is, if this person does not do his duty, then the accident will still have an accident.

This time, Yang Heng used a two-line indication, one line, which was a multi-way telegraph line. It needs to have an operator in control. Whenever a train passes through a station. It will send a signal from this station, and after the switchboard turnaround, it will notify the next station that the opposite train is coming, and if there is a train in the direction behind it, this station will pull the switch of the first train to the waiting railway, and after the next train passes, the train will continue to move forward.

Another signal is that a train passes by the station. When this station notifies the switchboard, it will also notify the next station, saying that the train is coming, and there is a signal for the turnout, and the turnout signal will notify the station, and the turnout is in what direction, and the station duty staff will use the signal light to notify the personnel of the turnout, or directly arrange for the personnel to go out to the turnout, and the turnout is not wrenched. One is the report of the turnout worker, and the other is the display of the signal.

In addition to these few signals show the line. There are also two telephone lines, this is a phone booth on the road, let the railway maintenance workers to use, when they find that the railway is faulty, they will send a signal in the nearest telephone booth, notify the general control room, the general control room will use the telephone to notify the two stations of the faulty section, and even related stations, so that the train that is running on the road stops running at the nearest station, waiting for the maintenance of the railway fault to be completed.

In this way, the phone call that has been in the boudoir for a long time also appeared in front of people for the first time. However, at this time, the telephone has been changed to a lightweight telephone, which is not much different from the kind of military telephone in the previous life, except that the shell is not made of plastic, basically Yang Heng has copied the shape of the portable telephone, that is, the shell is made of wood, naturally, there is also a desktop telephone, which is a telephone used in the room, but the working principle has not changed.

Similarly, the dry batteries used for these phones have not been developed, so on the portable telephone, Yang Heng uses a head-mounted telephone handset and microphone, and the crank adopts two functions, the first function is naturally used to ring, after the ringing out, there will be a circuit to cut off the ringing circuit, and then this crank needs to continue to shake, he wants to provide a power supply to the telephone to use, which can be regarded as an innovation, however, this kind of phone, when receiving the ringing, You have to shake the crank up before you can answer the call, and if you shake it out, you can just shake it down without pausing until the call is over.

"Xuewen, this, but you're not kind, your phone must not have just been invented, I've heard this term a long time ago, but I didn't really pay attention to it, you can explain it to me."

Li Er is really a little unhappy, but what if you are unhappy.

"Your Majesty, this phone, it's not that the minister wants to hide it from Your Majesty, but when this phone was developed at that time, it was not very successful, even now it is not very successful, and an important part of it has not yet been manufactured, but the line of this railway is already very long, so the minister must take it out and use it, otherwise, what should I do if there is an accident on this train, especially when there are important people or important transportation projects, each station needs to add double duty personnel, so as to ensure the normal operation of the railway."

"What do you mean by unsuccessful?" "Your Majesty, you can pick up the phone and listen to see if there's a murmur here." There is a buzzing AC sound in this phone, which is also caused by insufficient AC filtering, if you use dry batteries, there is no such phenomenon.

"Well, really, it doesn't sound very clear." "Your Majesty, if you use this phone again, this is a portable telephone, especially when it comes to combat, it is the most suitable to use." "Well, this one has been shaking the phone, if it has been a long time, this shaking is fast and slow, and the sound will be big and small, and it is easy to hear clearly." Soon, Li Er also discovered where the shortcomings of this phone were.

"Well, this phone can't be used on the battlefield." "Yes, Your Majesty, if this phone is placed on the battlefield, it must be in a clear voice, that is, the voice should be softer and clearer, otherwise, you can't go to the battlefield, and it's easy to make mistakes when you go to the battlefield. This is still the result of many improvements. Yang Heng shouted.

"Okay, I'll pardon you, but you have someone in charge of that telegram, and someone in charge of sports, so is there someone in charge of this call?" Li Er naturally remembered, and even thought that Yang Heng would definitely arrange a younger brother to be in charge of the phone.

"Yes, Your Majesty, he is another cousin of the minister, Yang Kun." "Cheng, I also gave him an official position from the supervisor of the sixth grade, and it was also merged into your information supervisor and placed under your management, and the name of your official position was changed to the telecommunications young supervisor." "Thank you, Your Majesty."

So, Yang Heng and his three cousins now have a formal official position, and among them, Yang Heng's official position is the highest, Zheng Sipin, Yang Hu is second, Zheng Wupin, Yang Li Yang Kun is even second, from the sixth product, naturally, this responsibility is not the same, compared to Yang Hu, the responsibilities of the two of them are relatively simple, mainly to train some operators, as well as train some line maintenance personnel, and even equipment maintenance personnel, if there is something that cannot be maintained, they will go directly to the maintenance, and Yang Heng is to finish for them, That must be something they can't do, so let Yang Heng do it.

At the same time as having a telephone, correspondingly, some ministers' homes immediately installed telephones, and even some people revoked the telegraphs, however, the telegraphs in Li Er's palace were not revoked, and a lot of telephones were also installed, and at the same time, Yang Heng and the royal family jointly opened a telephone and telegraph factory, which specialized in the production of telephones and telegraphs, and even iron wires and telephone lines.

Now through the hot air balloon observation in the air, you will find that one by one telephone poles are everywhere, spider silk lines along the railway and even along some highways in all directions, from time to time there will be a person carrying a bag riding through the underside of the power line, this is the maintenance line workers.

The breath of Datang is getting closer and closer to the present. If you want to say that the ministers have no opinions, there are naturally some who have opinions, but there are many ministers who use telephone and telegraph, and before this opinion has been issued, there is no sound, and even the telephone is installed in their homes, which is convenient, if you want to find someone, or even visit someone, as long as you say hello by phone, the other party will wait at home, how good. (To be continued......)