Center City Commuter Connection

The Center City Commuter Connection (CCCC), commonly referred to as "the commuter tunnel", is a passenger railroad tunnel in Center City Philadelphia, Pennsylvania, The tunnel was built to connect the stub ends of the two separate regional commuter rail systems, which were originally operated by Pennsylvania Railroad and the Reading Company, two rival rail companies.

Center City Commuter Connection
Train emerging from the Center City Commuter Connection at Jefferson Station
Overview
LocationPhiladelphia, Pennsylvania, U.S.
SystemSEPTA Regional Rail
StartSuburban Station, Walnut–Locust station
EndPortal near 8th and Spring Garden Streets
No. of stations2
Operation
Work begunJune 22, 1978
Constructed1978–1984
OpenedNovember 12, 1984 (1984-11-12)
OperatorSEPTA
TrafficRail
CharacterPassenger
Technical
Length1.8 mi (2.9 km)
No. of tracks4
Track gauge4 ft 8+12 in (1,435 mm) standard gauge
ElectrifiedOverhead line, 12 kV 25 Hz AC
Operating speed40 mph (64 km/h)
Route map
former Reading Company lines
Temple University
Ninth Street Branch
Spring Garden Street
Callowhill Junction (City Branch)
Reading Terminal
Jefferson Station
(Market East)
Suburban Station
former Pennsylvania Railroad lines

All of the SEPTA Regional Rail lines except for the Cynwyd Line pass completely through the four-track tunnel, which contains two underground stations, Suburban Station and Jefferson Station, and the above-ground upper-level concourse for the east–west commuter lines serving 30th Street Station.

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