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The A Division, also known as the IRT Division,[2] is a division of the New York City Subway, consisting of the lines operated with services designated by numbers (1, 2, 3, 4, 5, 6, 7) and the 42nd Street Shuttle.[3] These lines and services were operated by the Interborough Rapid Transit Company before the 1940 city takeover. A Division cars are narrower, shorter, and lighter than those of the B Division, measuring 8.6 by 51 feet (2.62 by 15.54 m).[4][5]
| A Division | |
|---|---|
 | |
        (42nd Street) | |
| Technical | |
| Track gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
| Minimum radius | 147.25 ft (44.88 m)[1] |
The following lines are part of the A Division (services shown in parentheses; lines with colors next to them are trunk lines):
| Station service legend | |
|---|---|
 |
Stops all times |
 |
Stops all times except late nights |
 |
Stops late nights only |
 |
Stops weekdays during the day |
 |
Stops rush hours only |
 |
Stops weekdays in the peak direction only |
| Time period details | |
 |
Station is compliant with the Americans with Disabilities Act |
| ↑ |
Station is compliant with the Americans with Disabilities Act in the indicated direction only |
| ↓ | |
 |
Elevator access to mezzanine only |
- IRT 42nd Street Shuttle (S
train) - IRT Broadway–Seventh Avenue Line (1
2 3 trains) - IRT Dyre Avenue Line (5 train)
- IRT Eastern Parkway Line (2 3 4 5
trains) - IRT Flushing Line (7 <7>
trains) - IRT Jerome Avenue Line (4 5 trains)
- IRT Lenox Avenue Line (2 3 trains)
- IRT Lexington Avenue Line (4 5 6 <6> trains)
- IRT New Lots Line (2
3 4 
5 trains) - IRT Nostrand Avenue Line (2 5 trains)
- IRT Pelham Line (6 <6> trains)
- IRT White Plains Road Line (2 5 trains)
Numbers were assigned to subway services in 1948:[6]
| Name | North end/type | |
|---|---|---|
| 1 | Seventh Avenue Local (all times) | Broadway |
| 2 | Seventh Avenue Express (all times except late nights) | White Plains Road |
| 3 | Seventh Avenue Express (all times) | Lenox Avenue |
| 4 | Lexington Avenue Express (all times except late nights) | Jerome |
| 5 | Lexington Avenue Express (all times except late nights) | White Plains Road |
| 6 | Lexington Avenue Local (all times) | Pelham Bay Park |
| 7 | Flushing Express peak direction (rush hours) | Flushing |
| Flushing Local (all times) | Flushing |
The 42nd Street Shuttle and Bowling Green–South Ferry Shuttle also provided subway services, and elevated service remained on the Third Avenue Line and Polo Grounds Shuttle.
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