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In page Network Rail:

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Network Rail has an internal infrastructure database known as GEOGIS. The system uses codes for four-digit Track IDs to identify which line at any location is referred to. The first number refers to track direction, with values of 1 (Up), 2 (Down), 3 (Reversible/Bi-directional), or 4 (Merry Go Round Loop). The second number refers to track use, which can be 1 (Main or Fast), 2 (Slow, Local or Relief), 3 (Goods), 4 (Single line), 5 (Loop), 6 (Terminal or Bay), 7 (Crossover), 8 (Other or Engine), or 9 (Single Siding). The third and fourth numbers refer to the track number, which can be any number from 00 to 99 inclusive, and are usually numbered sequentially.[citation needed]