Few days ago I have construct a express metro system in my city and I would like to share some idea and suggestion in designing such system.
Background
At the beginning, I am going to construct a circle line metro that connect four cities in the map. But there is problem that the round trip time is too long and having too much station that the depot cannot affort the huge number of train and the traveling time become unacceptable.
So, In the biggest urban section, I change the track into 4-lines and provide express and local service.

Application
As we are not allow to build platform on the inner track of 4-track section, The local train will travel on two side of the track and the local station layout will be like this.
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The interchange station will be like this and let passanger to change between local and express.

Suggestion
In fact, the local-express interchange station in practical world will be like this, the interchange between two lines is cross platform interchange and passanger can just walk to other side of platform and boarding the different types of train. In CIM2 it is not possible to do so due to the restriction of platform construction.

1.) For metro station, platform can be build on both side of track. Or even left and right hand side build together (What we call Spanish solution)
2.) For metro station, platform near by each other can be stick/integrated together an passenger can walk through the two platform without using the teleporter. This can enhance the interchange efficiency.
Background
At the beginning, I am going to construct a circle line metro that connect four cities in the map. But there is problem that the round trip time is too long and having too much station that the depot cannot affort the huge number of train and the traveling time become unacceptable.
So, In the biggest urban section, I change the track into 4-lines and provide express and local service.
Application
As we are not allow to build platform on the inner track of 4-track section, The local train will travel on two side of the track and the local station layout will be like this.
The interchange station will be like this and let passanger to change between local and express.
Suggestion
In fact, the local-express interchange station in practical world will be like this, the interchange between two lines is cross platform interchange and passanger can just walk to other side of platform and boarding the different types of train. In CIM2 it is not possible to do so due to the restriction of platform construction.
1.) For metro station, platform can be build on both side of track. Or even left and right hand side build together (What we call Spanish solution)
2.) For metro station, platform near by each other can be stick/integrated together an passenger can walk through the two platform without using the teleporter. This can enhance the interchange efficiency.