• "mainTrack":
  "A main track is either an open track between operational points or the extension of an open track within an operational point. It typically connects stations and is used for planned train journeys (trains in commercial operation or trains being moved between opera-tional points)."
  
  
• "secondaryTrack":
  "A secondary track is a track used for planned train journeys running in commercial operation or trains being moved between operational points, but it is not an open track between operational points or the extension of an open track. "
  
  Best practices: "A double track between stations may extend to 4 tracks in a station, with 2 tracks being the extensions of the open tracks and 2 additional tracks. The extensions would typically be defined as mainTrack while the additional tracks are defined as secondaryTrack."
  
  
• "sidingTrack":
  "Siding tracks are tracks that are not used for planned train journeys, except at the start and end of a train journey if the train is shunted to or from a parking spot."
  
  
• "connectingTrack":
  "Connecting tracks are tracks that do not fall into any of the above cate-gories. They are typically very short and connect other tracks. Examples are short track sections connecting two tracks where switches allow to move from one track to the other."
  

I am not sure if there is such a big difference between the different types of track (usage): In particular, for "sidingTrack" and "connectingTrack" the usage is the same like the possible usage. Major physical characteristics of the track are - so far - not modelled in railML.

• Wiki, attributes: This is a regular track a of line used for frequent passenger and freight transport.
  
• Wiki, best practice: NO: hovedtogspor/hovedspor, DE: Durchgehendes Hauptgleis, de-CH: Hauptgleis/Signalisiertes Gleis, fr-CH: Voie signalée, it-CH: Binario segnalato, NL: Hoofdspoorweg, CZ: Hlavní kolej
  
• Forum: Main tracks of the line and their continuation in the station.
  

• Wiki, attributes: This is a track not frequently used (e. g. loops for overtaking and/or crossing in stations).
  
• Wiki, best practice: NO: togspor, DE: nicht-durchgehendes Hauptgleis, NL: Lokaalspoorweg, CZ: Spojovací kolej
  
• Forum: Other signalised tracks (with train routes).
  

• Wiki, attributes: This is a siding.
  
• Wiki, best practice: NO: øvrige spor/sidespor, DE: Nebengleis, de-CH: Nebengleis/Nicht-signalisiertes Gleis, fr-CH: Voie non-signalée, it-CH: Binario non segnalato, NL: Raccordement, CZ: Manipulační koleje
  
• Forum: Non-signalised tracks (without train routes, but possibly shunting rountes)
  

- Signal 69B1 should stay at the left side of the track?
- 69N1/N3 do not necessarily need a switchable Zs3 but possibly a Zs7, which 69N2 surely needs.
- 69P1 would probably need a Zs2.
- In Kudowa, 3a should be the siding (Ladegleis) and the route to 3b should go through 1a to get a route-point in the middle of the station track ("echte Mittelweiche").
- I guess the sidings in Kudowa would need a Flakenschutz (5, 3a) and Spitzenschutz (W01) = de-railers (Gleissperren).
- In Kudowa, K06 would probably have a point number (W06ab/cd) and be numbered in consequence with the other's from left to right (between W02 and W03).
- If it shall be possible to enter Kudowa track 2 with trains, it should have an So8 as at the neighbouring track 1b.
- Sure that there would be a track circuit around Instersee W01? Why? The point can only be set by hand!
- Why is there an insulated rail joint at 69VWc and 70A?
- It is not possible to shunt, not even to run around with an engine in Cranz since there is no Ra10 and no insulated rail joint between any home signal and outer point.
- The speed boards at Arnau and Cranz should be at the face of the outer points. (Arnau: km 0,5 vs. 0,8 = 300 m too far outside - why?)
- If the speed restriction at the level crossing would be permanent - which we probably assume for it to be published in timetables - it would have to be signalled with Lf6/7 - not with Lf1/2. (We can probably make a compromise here.) But the level crossing should have no barriers to give a reason for the speed restriction of only 20 kph... and the speed restriction should be valid for head of train only (spitzenaufgelöst) to show how this is encoded in railML.
- In Arnau, please clarify in the drawing whether platform 1 belongs to track 1 and whether track 1 has one or two platform edges.

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I still miss a line without switchable signals and with self-restoring points as it was shown in the original draft for the Advanced Example. Such minor-railway operation is very common in many countries. In that, the stations of Kudowa and Grestin would have marker boards only instead of signals and Grestin would have self-restoring points, and Instersee would be an Anst. With that, it would be possible to show in the example files
- to encode speed profiles through different routes (Grestin),
- to encode stations without points where trains regularly turn around (Funera, Endhaltepunkt),
- to encode train crossings and train massages (Zuglaufmeldungen) in timetables (concerns stopDescription and possibly connections).

Dirk.