Market Frankford Subway Elevated (MFSE) Automatic Train Control (ATC) Replacement Project

The existing Automatic Train Control (ATC) system in service on the MFSE is approaching the end of its life, and SEPTA has begun planning for its replacement. The ATC system was completed in 2003 as part of a major upgrade of the MFSE that included extensive improvements to the elevated structure. The ATC project included a new wayside ATC signal system, supplemental traction returns bonding, an upgraded control center to monitor and control the system, and a new universal interlocking in the underground section at 11th Street.

All ATC systems currently in service on the MFSE will be replaced as part of the ATC Replacement project. In addition, a new universal interlocking system will be installed in the underground section around 8th Street. The project will require traction return and third rail configuration changes as well as the replacement of all carborne ATC equipment.

Separately, SEPTA is preparing for the procurement of replacement railcars. It is expected that the new railcars will have different acceleration and braking characteristics than the current equipment. The new ATC system will support the transition from the existing railcar fleet to the new. The existing ATC system is designed for a headway of 2 minutes and 15 seconds. The new ATC system shall be designed to safely improve on that headway in conjunction with the procurement of a new fleet of vehicles with better braking characteristics. Operational simulations on the OpenTrack platform were conducted and show a 90-second headway is possible with the new ATC system design.

The MFSE rapid transit line is the busiest route in the SEPTA system and, as such, presents significant operational constraints on this project. The construction phasing plan was developed to mitigate risks to both the construction schedule and rapid transit operations, drawing on input from key SEPTA operations leadership and all project stakeholders. An operational outage plan was developed to accommodate construction activities accounting for customer needs such as transfer services available, station accessibility, major public events, and community impact.

Garg Consulting Services, Inc. (Garg), is providing Constructability Reviews and Construction Phasing design services under Task 5 and Task 8 of Phase A – Design Services and performing site inspections under Task 2 of Phase C – Construction Phase Support Services.

The design scope includes preparing a set of 100% plans, specifications, and other design documents for a third-party contractor to furnish and install the replacement ATC system and associated improvements for the MFSE. Responsibilities include the construction phasing plan and constructability review.