User:Timitry/4-way junctions

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Railway junctions
Tutorial: Junction basics | 3-way basics | 4-way basics
Advanced junctions:
3-way: 1-track sideline and 2-track mainline | Example 2 | Example 3
Example 2 | Example 3
Example 2 | Example 3



Basic junctions

The very basic 4-way junction

The most simple 4-way junction

This would be the easiest way to build a 4-way-junction in OpenTTD, however, when using block signals, it will really only work for very low traffic, since only one train at a time can use it. If you use path signals instead, the efficiency increases, but will still only allow low to moderate traffic.

If using block signals

Increased efficiency for block signalling

This improved design won't make any notable difference if using path signals, but if you prefer block signals, it will increase the throughput of the junction, as trains turning right can do so without entering the main junction block.


The regular cloverleaf

The regular cloverleaf, as often seen in games.

The picture shows a junction which is mostly called "cloverleaf", since it kind of looks like one. You might see it being used quite often, however, due to the tracks merging before splitting, it might cause gridlocks and should not be used as seen in the picture.

Cloverleaf with split before merges

An improved version of the cloverleaf, which works quite well.

This modified cloverleaf has its splits before the merges and will due to that not cause any gridlocks. The curves are quite narrow and might need to be adjusted to your trainlength and speed. Also, the bridges and tunnels are not doubled and might cause traffic jams. Still, the junction will work quite well for moderate traffic.

Doubling the bridges and tunnels...

The same as above, just with doubled bridges and tunnels

Here is another example, it shows the cloverleaf from above with doubled bridges and tunnels, which will help to prevent jams. The curves are still quite narrow, but expanding them is an easy task.

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