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
Famous quotes containing the words signal and/or numbers:
“The experience of a sense of guilt for wrong-doing is necessary for the development of self-control. The guilt feelings will later serve as a warning signal which the child can produce himself when an impulse to repeat the naughty act comes over him. When the child can produce his on warning signals, independent of the actual presence of the adult, he is on the way to developing a conscience.”
—Selma H. Fraiberg (20th century)
“Green grow the rushes-O
What is your one-O?”
—Unknown. Carol of the Numbers (l. 2–3)