GEOGIS

GEOGIS is an infrastructure database used by Network Rail^[1].

GEOGIS uses the following codes for four-digit Track IDs to identify which line at any location is referred to.

First number - Track Direction

1 Up

2 Down

3 Reversible / Bi-directional

4 Merry Go Round Loop

Second number - Track Use

1 Main or Fast etc

2 Slow or Local or Relief etc

3 Goods

4 Single line

5 Loop

6 Terminal or Bay

7 Crossover

8 Other or Engine etc

9 Single Siding

3rd & 4th number - Track Number

Usually numbered sequentially. Can be any number 00 to 99 inclusive.