Center City Commuter Connection

Center City Commuter Connection
	Train emerging from the Center City Commuter Connection at the Jefferson (formerly Market East) 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
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

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