In Zhao Xin's view, there are still big problems with the railway, in fact, there is already a foundation, which is led by horses, and there is still a big difference from the train in a mature state.

All the problems can't hide the excellent performance of the train.

Once you run, the speed of about 20 kilometers per hour, 8 hours a day, at least more than 300 kilometers, not as fast as 800 miles, but it is definitely not bad, the speed of 600 miles, if once repaired, from Bianliang to Longxi, it may only take 2 and a half days.

For trains that are accustomed to seeing the arrival of later generations, and even high-speed railways with a speed of 350 kilometers per hour, such a speed is even slow to a certain level, but the speed of 600 miles a day still carries a large number of materials, which is too important for the Northern Song Dynasty.

You think, if the Western Xia invades, the border army lacks and can only rely on the city to hold on, and it will take 2 months to transfer the army from Bianliang, and it will definitely be impossible to transfer from Bianliang, only the closer ones can be transferred, but once this railway is repaired and arrives in 2 and a half days, what will it be, even if there are some losses in the early stage, it will be quickly recovered.

Not to mention, the capacity of this carriage is equivalent to the capacity of 20 carts, which is the key, fast speed, large capacity, the problem that plagued logistics materials before, after the completion of this road, it is no longer a problem, which is very important for the military aspect.

However, Zhao Xin knows that it is not easy to do this, and there is a very big problem, that is, bridges.

China's bridges, world-famous, those thousand-year-old, or even thousand-year-old stone bridges, in the 21st century, still play a role, which can already be seen that the magic of this bridge.

However, the bridge needed by the railway is flat, not arched, which is China's shortcoming, not to mention the railway bridge, which has huge requirements for performance and load-bearing capacity.

In the Northern Song Dynasty, rivers were used as transport capacity, so there were a lot of rivers, not to mention 1,000 kilometers, maybe thirty or fifty kilometers, there was a and, how to cross the bridge, this is a problem.

There are steel bars and cement, but the construction of railway bridges, especially large railway bridges, for example, the kind that crosses the Yellow River, if these are not solved, under the premise that they cannot be directly reached, the construction of this railway is also a bit chicken.

Zhao Xin knows very well how difficult it is to popularize the railway network in the Northern Song Dynasty, the bridge is only one aspect, sealing, crossing the bridge, and the intersection with densely populated cities, these are all problems, or huge problems, which must be solved little by little.

The improvement continues, mainly to reduce the importance of the carriage, and in the test, the problems found are solved one by one.

However, the construction of the first railway has been set, although the Dinghai Navy is not large, but there are hundreds of square kilometers, similar to some islands, the entire Dinghai Navy, the plain is on the outside, Zhao Xin's purpose is to build a ring line outside.

As designed, the plain near the port was the main residential area of the Dinghai Navy, and on the other side, the other part of the city, which bypassed the central high mountains, was a smaller, relatively high place, where the current steel mill was located.

From the steel mill to the port, it is about 30 kilometers, and this road itself is prepared to build a cement road, but now, the emergence of this railway has become more convenient, and the railway can accommodate more things than horse-drawn carriages, and the speed is also faster, but it is just a little detour.

But it can allow the things produced by the steel mill to be quickly transported to the port, and then transported to Haizhou.

This is the first one, when this one is through, the other one, is from the Hongze Lake in Haizhou, this section is a little far, about 300 miles, because this piece is not a water town in the south of the Yangtze River, there are water systems everywhere, of course, it is not the north, at a glance.

It needs to be inspected on the spot, but Zhao Xin believes that there will be more than 10 bridges, some of which can choose to go around and some that must be built, so that the bridge will become the only option.

Compared with the cement concrete bridge with a higher technical level, Zhao Xin is more inclined to steel railway bridges, steel can provide sufficient support, after having a steelmaking blast furnace, you can complete more than 10 cubic castings at one time, for some no more than 1 kilometer wide river surface, castings on both sides, combined, you can.

But before, there was a problem that had to be solved, the connection problem of iron castings, you can choose to use reinforced concrete, and some hooks and the like, but Zhao Xin prefers to get the electric welding out.

Electric welding, this is actually a very convenient tool, the connection of two pieces of steel, electric welding is much better than other methods.

It's a pity that Zhao Xin doesn't know much about electric welding, he can only study it slowly, this needs to depend on fate, if you are lucky, it may come out soon, if you are unlucky, you will die.

Soon, Zhao Xin arranged these two railways, in Dinghai, this is no problem, they are their territory, the government can make an order, Zhao Xin also organized some survey teams, and carried out a series of measurements on the ground, which are completely new.

Zhao Xin came up with some measuring instruments, some of which were even beyond this era, but it was not easy to train personnel.

Even the measured data should be used, and the previous laying is the most suitable for laying a 3-kilometer-long flat road, and the round-the-island railway is not so easy, and even such a 3-kilometer can be used or not, and it is still a problem.

However, everything has a beginning, as long as the head is opened, everything is easy to do, Zhao Xin began to train people, teach them to use these instruments, and find professional masons, teach them, some characteristics of the railway, precautions.

The curve should not be too big, the slope should not be too high, and if you can walk from the mountain, you will not walk from the mountain.

After all, in this era, it is almost impossible to dig a tunnel through the mountain before explosives and drilling are available.

Fortunately, most of the coastal places around the island are relatively flat places, and there is no burden of drilling mountain tunnels.

This stumbling is generally completed, but in the future, the promotion work will be difficult, in the plain area is fine, some of the usual plains, with the help of the steel frame railway bridge, should not be difficult, but in the central and western regions, all over the various peaks and plateaus, then there will be problems, it seems that the steps are too big, and it is not good.