Station Area ID codes

As you say the first number relates to the level within the station and the second one is a room or structure number such as a passageway or machine room.

There were from my recollection, introduced as a result of the recommendations following the Kings Cross fire. These numbers are cross referenced on the Station Plans which are accessible to London Fire Brigade. These are numbered originals (known as Controlled Copies) and are changed if ever there is an alteration.

So in the event of a fire – the LFB can check the maps and locate the areas they need to work in or access.

Station staff often had uncontrolled copies, and these were very useful for staff familiarisation training and so on. I used to refer to the numbers during PGI’s (Planned General Inspections), as it helped eliminate any confusion as to which room you were referring to during the inspection.

Dean

The lower numbers do follow a pattern.

This also helps the fire brigade identify rooms that may have people inside in the event of a fire.

For security reasons it is probably better not to disclose full details.

Absolutely. However, sensible discussion is fine within the Forum Rules.

Looking at Chris's photo of Sudbury Hill - doors to gents and station supervisor's office in ticket hall...


(click for a larger version)

...there are three location plates visible:

001 - presumably the ticket hall (not on a door)
053 - SS office
427 - Gents Lav'

Which makes me wonder, how big does a room have to be to warrant a plate inside it rather than on the door to it? It also occurs to me that all of the above rooms could contain people; is the numbering system linked to a seach pattern, are lower numbered rooms more likely to contain persons? Taking it to the extreme, what happens in a station with more than a thousand rooms or structures on one level?

50mm margin from door frame on opening side. There are also standards for the spacing and order of the other door signs.

Spaces such as ticket halls you find a sensible spot where it can be spotted.

Every room/space has a plate particularly on sub surface stations.

Ground level is 1 and down to 13 (at Westminster)

A B C is above ground level with A first floor etc

Gradients?

I remember a Central Line driver friend of mine giving me a very thorough explanation of the importance on knowing the gradients, entering and leaving stations.

I believe that they are used to denote specific rooms/areas in a station. They were discussed a while ago as an offshoot of a quiz thread, but i can't remember when, or where to find it. Perhaps someone else might be able to find it.

1 to 13 going down, A,B & C going up.

Bottom number starts from 001 for ticket hall.