The disadvantage lies in hardship with modifying the line and the time it takes to go back.
In addition to that,the loop must feature trains with similar speed and length.
Longer and heavier trains will block shorter and lighter trains.
In such case it’s possible for you to frequently see faster trains riding slowly behind slower ones.
Combine all stations in such a way that you create a closed circuit.
Then place semaphores in equal distances.
Place a semaphore before each station, even if it means a shorter or longer section.
First release and observe two trains on the road, then try adding another train.
The placement of the stations is important in such connection.
Such station is connected to the main line and it has semaphores before and after each platform.
Usually it will be the destination of all your trains.
Simply add a few platforms to the station.
The only disadvantage is the building cost and time you must spend on setting the signalization.
Thanks to that you will create a road that many trains can use to move in various directions.
Place two-directional semaphores before the stations so that the trains can enter and leave the same route.
When needed or new industrial points are unlocked on the map, simply connect them to the main road.
When building crossroads, you must remember to connect all tracks so that no train will lose its route.
One route uses regular rails, another goes above them through a bridge or underground through a tunnel.
Such option greatly speeds up the journey.
You will also avoid any jams or accidents.
Remember to combine exterior tracks to the intertwining road, like on highway exits.

This enables you to connect additional line to the main line with no trouble.
When building larger and larger connections, you will notice traffic jams near stations.
More platforms aren’t always solving the problem as frequently the trains will return to the passing loop/second railroad.
With many trains or even with few but fast trains you will need a different solution.
On the other side you create tracks and add another line of semaphores(2).
What’s more, when one train will unload cargo, another can enter a different platform.
It is one of the best solutions that greatly unload traffic even on the most crowded routes.
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