Signal Numbers
All signals have an alpha-numeric number that relates to their location within the subway system. The number is assigned using the Chain system of measurement, whereby a signal's number is assigned based on the nearest chain measure.
Each line or portion of a line has an assigned letter, and that precedes the number ascertained by the Chain measure. Signals that are on a northbound portion of track use the nearest even valued chain measure, where signals on a southbound portion of track use the nearest odd valued chain measure.
| Line | Signal prefix | Even | Odd | Chain 0 mark |
|---|---|---|---|---|
| Yonge | N (northbound only) S (southbound only) |
northbound | southbound | Does not exist (continues from the University numbers) |
| University | U | northbound | southbound | South of St George station (counts up towards Museum) |
| Spadina | SP | northbound | southbound | North of St George station (counts up towards Spadina station (YUS)) |
| Bloor-Danforth | B | westbound | eastbound | West of Kipling station (counts up towards Islington) |
| Sheppard | SHP | westbound | eastbound | West of Sheppard station (counts up towards Bayview) |
Read more about this topic: Toronto Subway And RT Signals
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