How to Use Procedural Track

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The information in this Wiki Page applies to TANE, TRS19, Trainz Plus and TRS22. This guide covers the use of procedural track in Trainz Surveyor, not how to create procedural track assets - see Trainz Wiki Links at the bottom of this page.


In Summary:
DotPoint.JPG Procedural tracks are specific track splines that have been created for use with Trainz versions from T:ANE onwards
DotPoint.JPG Procedural tracks provide animated switch points plus check rails and frogs at track junctions
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What is Procedural Track?

Procedural track works just like the standard (or "non-procedural") track that was the only type available before T:ANE. However, it provides additional cosmetic features (animated blades, frogs and check rails) to junctions. These features are built into the track asset and do not have to be manually added when laying track.

Procedural Track


Non Procedural Track
NotePad.PNG Notes:

The switch blade animation will show in both Driver and Surveyor but in TRS19 and later versions the Pause option in Surveyor must be checked OFF (no tick).
Stop.PNG If you turn pause OFF after using the UDS (available in TRS19 Platinum Edition and later versions) to switch from Driver to Surveyor then any consists that were moving in Driver will immediately start moving in Surveyor which can result in collisions and derailments
Procedural Track
Non Procedural Track

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Identifying Procedural Track

There is no specific content category, such as "Track, procedural", that can be used to distinguish between procedural and non-procedural track assets. Like many assets it relies on the name given to the asset by the content creator. Most creators seem to have included the characters PRO in the track name - for example "Protrack", "Procedural" or just "Pro". This can be used to narrow down the search in CM. A typical CM custom filter that would have a good chance of identifying most procedural track assets is shown below.

PencilTips.PNG All procedural track assets have a minimum build version of 4.2 - but this does not mean that any track with this build number (or above) will be procedural.

Laying Procedural Track

DotPoint.JPG The "fall-back" position for procedural track is to act and look like ordinary (non-procedural) track

Procedural tracks are laid down in Surveyor just like any other track. Track junctions are formed in the same way as they are when using non-procedural tracks. The difference is that the additional features (animated switch blades, frogs and check rails) are automatically added when a track junction is correctly formed using procedural tracks.

Faulty (incorrectly formed) procedural track junctions will work perfectly well as non-procedural junctions - they can be switched left and right, and trains will pass over them correctly. But the special features that they have will not appear.

DotPoint.JPG A red track spline circle in Surveyor Classic indicates that the procedural track junction is faulty


Faulty procedural track junctions are indicted in Surveyor by:-

  • solid red track spline circles, or
  • flashing red/white or red/yellow track spline circles

DotPoint.JPG A red track spline "dot" in Surveyor 2.0 indicates that the procedural track junction is faulty
DotPoint.JPG Surveyor 2.0 is a feature of Trainz Plus (available to subscribers only) and TRS22 for those who have an annual Trainz Plus subscription

A normal procedural track junction in Surveyor 2.0 is shown as a black track spline point
A faulty procedural track junction in Surveyor 2.0 is shown as a red track spline point. A better indicator is the absence of the moveable switch blade and the check rails/frogs.

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Procedural Track Errors

Some of the most common causes of red track spline circles are listed below. Remember, the presence of procedural track errors will not stop track junctions from working correctly as normal (non procedural) track junctions.

Incompatible Tracks
Procedural-NonProceduralJunction.png Fault:

One of the tracks used to form the junction is not a procedural track


  • ignore, or
  • if possible replace the non procedural track with a procedural track
Curve Too Tight
Procedural-CurveTight.png Fault:

One of the diverging tracks has a curve radius that is too tight


  • Increase the curve radius
Track Splines Not Level
Procedural-SplineHeight.png Fault:

The spline circles that define the junction are not at the same height


  • adjust the spline heights to create a level junction

PencilTips.PNG One trick is to move the approach and depart spline circles closer to the junction spline circle (if possible) to reduce the length of track that has to be made level
Junctions Too Close
Procedural-JunctionsTooClose.png Fault:

A second junction has been added that is too close to the first and there is not enough room for the frogs/check rails to be added to the first junction


  • ignore, or
  • adjust the placement of the second junction to allow the frogs/check rails to be added to the first junction

NotePad.PNG This requirement can make it difficult or even impossible to use procedural junctions in yards that have very dense track junction layouts. Ignoring the "problem" may be the only option here.
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This page was created by Trainz user pware in June 2021 and was last updated as shown below.

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