Trains taking the same railway track

[Transporteiro]

Why the moronic train on the right side of the screen chose the railway track that is already taken by the train in the left side of the screen?

Shouldn't the signal right "below" the train depot signal to it that this railway track cannot be entered?

SCR2.PCX

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• Game version: TTD for DOS (emulated through DOSBOX) reading an original CD-ROM;
• Operating system: GNU/Linux Debian 12;
• TTDPatch: none;
• Used tools: none;

[odisseus]

I see just one train on the screenshot. However, if you have two or more trains in the circuit, you may indeed run into a problem.

I see that both of your tracks use two-way signals. This means that a train may choose either track regardless of the direction it goes, and indeed two trains going in opposite direction may very well choose the same track. When this happens, you'll get a deadlock that needs to be resolved manually.

To avoid deadlocks, use one-way signals on each track (except, of course, the short stretches right next to the platforms).

[Transporteiro]

I see just one train on the screenshot.

The one on the left is inside the station.

[jfs]

You have too many signals.

The signals right in front of the station platforms are superfluous, and having them causes exactly the situation you are asking about.

As odisseus suggests, you should learn to use one-way signals to guide your trains for the most efficient track use. You create one-way signals by first building a two-way signal, and then using the Build Signals tool keep clicking on the same signal.
One of the things you always want to do, whenever possible, is make sure you have directional tracks, basically make sure the trains "drive on the left" (or on the right; just pick a side for traffic and stick with it), doing that will help you avoid situations with trains going down a track where they will have to turn around because a different train had chosen to travel that track in the opposite direction, from the other end.

One of the rules of thumb for signals is: Don't place a signal such that, if a train stops at it, it blocks other trains going in different directions. That's not quite possible with the signal possibilities in original TTD, but it's still a thing to keep in mind.
What you have in your screenshot is exactly that: The train coming from the north is trying to enter the station, and it will eventually stop at the signal right in front of the platform. When it stops there, it blocks a train that wants to go in the opposite direction: The train already in the station, that wants to leave.

[Transporteiro]

You have too many signals.

The signals right in front of the station platforms are superfluous, and having them causes exactly the situation you are asking about.

As odisseus suggests, you should learn to use one-way signals to guide your trains for the most efficient track use. You create one-way signals by first building a two-way signal, and then using the Build Signals tool keep clicking on the same signal.
One of the things you always want to do, whenever possible, is make sure you have directional tracks, basically make sure the trains "drive on the left" (or on the right; just pick a side for traffic and stick with it), doing that will help you avoid situations with trains going down a track where they will have to turn around because a different train had chosen to travel that track in the opposite direction, from the other end.

One of the rules of thumb for signals is: Don't place a signal such that, if a train stops at it, it blocks other trains going in different directions. That's not quite possible with the signal possibilities in original TTD, but it's still a thing to keep in mind.
What you have in your screenshot is exactly that: The train coming from the north is trying to enter the station, and it will eventually stop at the signal right in front of the platform. When it stops there, it blocks a train that wants to go in the opposite direction: The train already in the station, that wants to leave.

This answer solved the problem.