Center City Commuter Connection

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Center City Commuter Connection

Train emerging from the Center City Commuter Connection at Jefferson Station
Overview
Location	Philadelphia, Pennsylvania, U.S.
System	SEPTA Regional Rail
Start	Suburban Station, Walnut–Locust station
End	Portal near 8th and Spring Garden Streets
No. of stations	2
Operation
Work begun	June 22, 1978
Constructed	1978–1984
Opened	November 12, 1984 (1984-11-12)
Operator	SEPTA
Traffic	Rail
Character	Passenger
Technical
Length	1.8 mi (2.9 km)
No. of tracks	4
Track gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Electrified	Overhead line, 12 kV 25 Hz AC
Operating speed	40 mph (64 km/h)
Route map
Legend 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 This diagram: view talk edit

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.

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.