X?? Location codes

[najaB]

I know that X?? location codes represent non-passenger infrastructure - depots, loops, junctions, etc. But it's there any particular reason why some junctions and loops have them while most don't?

 

[The Planner]

Depends a lot on whether they are mandatory timing or contractual monitoring points.

 

[najaB]

Depends a lot on whether they are mandatory timing or contractual monitoring points.

Am I right in guessing that those locations get the codes? Is this for consistency in the reports - to better match the three letter codes for stations?

 

[CockneySparrow]

Depends a lot on whether they are mandatory timing or contractual monitoring points.

Some are where old demolished boxes used to be