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The New York City Subway currently uses various letters and numbers to designate the routes that trains use over the differing lines in the system. Along with the color corresponding to the route's trunk line, these form a unique identifier for the route, easing navigation through the complex system. Several service labels have either been phased out or never been used. This list covers the labels not used as of July 2014. == A Division numbers == The A Division uses single-digit numbers for each route. Currently numbers 1 through 7 are in use. * 0, while not used publicly, is used as the internal designation of the 42nd Street Shuttle. * has been used in the past for various routes, most recently the Bronx portion of the Third Avenue El, ended in 1973.〔 * was used for skip-stop service on the IRT Broadway – Seventh Avenue Line from 1989 to 2005. It was also used as the designator for the IRT Dyre Avenue Line shuttle between 1941 and 1966. Two-digit numbers have never been used by the A Division, but have been seen on the current rollsigns of some trains, paired with colors used with other services. It is likely that these were assigned arbitrarily, for use if the MTA changed the additional rush hour express service designators from a "diamond" version of the regular number to a separate number. Two-digit bullets include: * A green 10 for the IRT Lexington Avenue Line〔http://www.nycsubway.org/perl/show?110075〕〔http://b24blog.blogspot.com/2012/10/the-r62-rollsign-almost-there-but-not.html〕 * A purple 11 for the IRT Flushing Line〔http://untappedcities.com/2013/09/19/cities-101-take-a-ride-on-the-8-11-and-12-trains-in-the-nyc-subway/〕〔 * A green 12 for the IRT Lexington Avenue Line〔〔 * A red 13 for the IRT Broadway – Seventh Avenue Line〔http://secondavenuesagas.com/2009/05/29/spotted-a-13-train-on-the-1-line/〕〔 All of these two-digit bullets can be seen in R62A rollsigns. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Unused New York City Subway service labels」の詳細全文を読む スポンサード リンク
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