Difference between revisions of "Presignal Bypass Station"

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As building a drop and pickup station for the secondaries it is always a hard task to build such a station. You must care about flow and speed to get the most effective station, impede by the enviroment like cities, industries and transmitters. What we are talking about are stations with about 20 entries, served by a [[Mainline|ML]] which got 3-4 lines. It require a lot of skills to build a proper joiner after the station and an even better splitter before the station that it can handle a huge amount of trains. This results in a lot of tunnels, brighes, presignal and so on...
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Building a large station, as is needed for pickups and drops for secondary industries, is a difficult task. There are many challenges due to the large capacity. The station must have sufficient flow to prevent jamming.  Cities, industries, and other landmarks provide boundaries to a desired station layout.
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A typical secondary station consists of about 20 platforms and is served by a [[Mainline|ML]] of 3-4 tracks. It requires a lot of skill to build a proper joiner after the station and it is even more difficult to build a splitter to allow the trains to efficiently access the platforms. This complexity typically requires lots of bridges, tunnels, and presignals.
  
 
==The Idea==
 
==The Idea==
  
At some time I have thought about a station layout which can handle every traffic amount by extending the station always the same way. My idea was the station is 90 deg turned by the track the trains come from. The trains so passes the station until they find a free slot and enter it. If the traffic is to much I extend the station with new slots. Then you add the presignals and it works... for slow traffic. As a train in the presignal area will block the whole presignal other trains have to wait at the beginning, even if there are a lot of slots free.
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This idea proposes a station that can be extended from a small-scale station to a much larger-scale station by adding platforms in the same pattern, without needing to completely redesign the station as its capacity grows. The station is turned by 90 degrees relative to the track the trains come from. The trains pass through the station until they find a free spot, and then enter it. If the traffic is too heavy, the station can be extended with more platforms. After adding presignals, it works... for slow traffic. As a train in the presignal area will block the whole presignal block, other trains have to wait at the beginning, even if there are a lot of slots free.
  
 
[[Image:Blocking the presignal area.png]]
 
[[Image:Blocking the presignal area.png]]
  
As you see the train which enters the station blocks the other train for joining the last slot. So I thought about some presignal stuff which transport the information "slot is free" from the slots at the end to the presignal at the beginning. I did this with a second line, similar to [[priorities]].
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As you see, the train entering the station blocks the other train from joining the last slot. So I thought about some presignal stuff which transports the information "slot is free" from the slots at the end to the presignal at the beginning. I did this with a second line, similar to [[priorities]].
  
 
[[Image:Second presignal line.png]]
 
[[Image:Second presignal line.png]]
  
Notice how the free-slot information is "traveled" thought the marked tiles around the train which blocks a segment. With this presignals the station can enter the presignals even if there already a train on it.
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Notice how the free-slot information "travels" through the marked tiles around the train which blocks a segment. With these presignals, a new train can enter the presignals even if there already a train entering the platform.
  
 
==How to improve the layout==
 
==How to improve the layout==
  
After the idea the station layout must be improved. As you see only a half of stationslots are used and cannot be used from this side as the signals blocks the entry. But they can be used from the other side.
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Only a half of station's platforms are used and cannot be used from this side as the complex signaling blocks the entry. But they can be used from the other side.
  
 
[[Image:Use the other side.png]]
 
[[Image:Use the other side.png]]
  
But how do they exit the station? This is not a real problem, I often use tunnels as followed.
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For an exit, the trains can go through tunnels under the presignal logic for the opposite entry.
  
 
[[Image:Station layout with tunnels.png]]
 
[[Image:Station layout with tunnels.png]]
  
If the trains leave the station they have enought space in the tunnel to wait if the exit isn't free yet. You can see the exit from the upper part goes east, the exit from the lower part goes west. This can be flipped/switched however you need it. You also see the disadvantage of this layout. This station and all tracks and signals with a TL of 5 are 23 tiles width. You need around 18+TL tiles space for the width. But - and thats the advantage - you can extend this layout as long as you need.
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If the trains leave the station, they have enough space in the tunnel to wait if the exit isn't free yet. You can see the exit from the upper part goes east, the exit from the lower part goes west. This can be flipped/switched however you need it. You also see a disadvantage of this layout. This station and all tracks and signals with a TL of 5 are 23 tiles width. You need around 18+TL tiles space for the width. But - and thats the advantage - you can extend this layout as long as you need.
  
 
[[Image:Full station with a lot of slots.png]]
 
[[Image:Full station with a lot of slots.png]]
  
You see here again you can choose from where the trains comes and where it go. This can be changed as whatever you want.
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You see here again you can choose from where the trains come and where they go. This can be changed as whatever you want.
  
 
[[Image:Station diagramm layout.png]]
 
[[Image:Station diagramm layout.png]]
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[[Image:Station goods drop ottdcoop.png]]
 
[[Image:Station goods drop ottdcoop.png]]
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[[Image:Station coal_ore drop ottdcoop.png]]
 
[[Image:Station coal_ore drop ottdcoop.png]]
  
[[Category:Research]]
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[[Category:Stations]]
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[[Category:Advanced Networking]]

Latest revision as of 10:56, 4 December 2013

Building a large station, as is needed for pickups and drops for secondary industries, is a difficult task. There are many challenges due to the large capacity. The station must have sufficient flow to prevent jamming. Cities, industries, and other landmarks provide boundaries to a desired station layout.

A typical secondary station consists of about 20 platforms and is served by a ML of 3-4 tracks. It requires a lot of skill to build a proper joiner after the station and it is even more difficult to build a splitter to allow the trains to efficiently access the platforms. This complexity typically requires lots of bridges, tunnels, and presignals.

The Idea

This idea proposes a station that can be extended from a small-scale station to a much larger-scale station by adding platforms in the same pattern, without needing to completely redesign the station as its capacity grows. The station is turned by 90 degrees relative to the track the trains come from. The trains pass through the station until they find a free spot, and then enter it. If the traffic is too heavy, the station can be extended with more platforms. After adding presignals, it works... for slow traffic. As a train in the presignal area will block the whole presignal block, other trains have to wait at the beginning, even if there are a lot of slots free.

Blocking the presignal area.png

As you see, the train entering the station blocks the other train from joining the last slot. So I thought about some presignal stuff which transports the information "slot is free" from the slots at the end to the presignal at the beginning. I did this with a second line, similar to priorities.

Second presignal line.png

Notice how the free-slot information "travels" through the marked tiles around the train which blocks a segment. With these presignals, a new train can enter the presignals even if there already a train entering the platform.

How to improve the layout

Only a half of station's platforms are used and cannot be used from this side as the complex signaling blocks the entry. But they can be used from the other side.

Use the other side.png

For an exit, the trains can go through tunnels under the presignal logic for the opposite entry.

Station layout with tunnels.png

If the trains leave the station, they have enough space in the tunnel to wait if the exit isn't free yet. You can see the exit from the upper part goes east, the exit from the lower part goes west. This can be flipped/switched however you need it. You also see a disadvantage of this layout. This station and all tracks and signals with a TL of 5 are 23 tiles width. You need around 18+TL tiles space for the width. But - and thats the advantage - you can extend this layout as long as you need.

Full station with a lot of slots.png

You see here again you can choose from where the trains come and where they go. This can be changed as whatever you want.

Station diagramm layout.png

Thats how it looks in a real game

Station goods drop.png

And that is how it looks on a real game in an openttdcoop-game

Station goods drop ottdcoop.png

Station coal ore drop ottdcoop.png

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  • This page was last modified on 4 December 2013, at 10:56.