Steam limits the size of the string I can paste on the guide, and since factorio blueprint strings can be quite large I uploaded a viewable .txt with full blueprint string to
GoogleDrive txt:https://drive.google.com/file/d/13Tk9g_YQ4F3Ylpcq5gzgBigLqqONyYP4/view

So the basic principal to this gauge of rails is that any interchange that you wish a uturn to be possible requires you to expand the interchange to fit a loop. However the 2 outside lanes are spaced the same distance required to uturn.

The 2 outside lanes are conisdered to be exit/entrance lanes where as the 2 center are express. During early game use the 2 rail bluprints, for less resources and less manual building. and then simply add the 4rail blueprints to your straight sections and swap out your interchanges. If resources are tight or your network is to large, use the Lane Changer blueprint to join the 2 types of rails.

I have a building code of having electric poles in center of my rails to ensure power is readily available anywhere I go.

When placing new sections of track match up the power poles for maximum distance between poles.

This is not needed at interchanges since some sections of rails will be to short or long to match up nicely. This is why there is a "rails only" blueprint for 2rails and 4rails.

I usually just have an interchange for all my 90 degreee turns since it ensures uturn capability, and i dont have to fidget with diagonals or anything like that.

Once upgrading from the eco 2 rails to the lategame 4 rails, please ensure that there is at least 1 lane changer in between interchanges, without doing so can cause some stations to be inaccessible.

This is the main reson for the gauging of this system. this allows mutple trains to use intersection as long as thier planned paths dont cross. Any direction your train goes through it will end up in the outside lane, unless its straight through, in that case it can be in either lane. It is important that you understand, that a mising lanechanger can make either a NOPATHFOUND or a very very long route due to a slow path being the only available.

You will need at least 1 lane changer in between interchanges once you upgrade to 4rails.

The "extra space" between these rails compared to others allows you to mine materials as well as make stations that dont protrude the rail's footprint.

All 2 rails blueprints reserve/plan for the 4 rails since that is the ultimate goal. 2 rails are really only needed for early game or perhaps very long paths for outposts.

not the fastest roundabout since it is quite large distance between signals, but it is built with economy in mind. if this is becoming a bottle neck, you will want to convert inputs and interchange to the 4 rails.
Use a lanechanger to convert 2-4 or 4-2 rails

Q: My trains can't pathfind.
A: Ensure a lanechanger (or uturn changer) between your station and each imediate interchange.

Q: Where are the diagonal rails and turn rails?
A: I don't believe in them, might as well use an interchange.

Q: Whats the best usage of lanechangers?
A: Depends on your world but usually 2 between each interchange, spaced with several train lenghts from the imediate interchange.

Q: How come the 2rail roundabout is so slow?
A: Because the rail block is larger than other roundabouts, in order to maintain cheepness, if it starts being a bottleneck it time to start upgrading to the more expensive but faster 4rail.

Q: What about a T junction?
A: Just use the 4 way interchange, the unused direction will not effect the throughtput, and may become useful later

Q: Why do the pictures not match?
A: I updated the blueprint book to support new features of the 1.0 release, as well as a few minor tweaks, but the "new" book is used the same way.

Q: What happened to the blueprint of stations inside of the footprint of the rails?
A: Honestly i NEVER use them, and it would only be ready for use if you used the same train length and didnt have to worry about refueling. So i removed them from the 1.0 version of the bp book

Q: What if i am insane? oh, and also want 6 gauge rails book with a similar system?
A: https://drive.google.com/file/d/1o-hG3PSfoGpSj9fYZaXTIfrvUX5LMGZF/view



Q: Why does your spelling hurt so bad?
A: Too busy playing Factorio.