CP243 Interlocking Project

A new four-track interlocking system

The CP243 Interlocking Project includes installing a new four-track interlocking system on the New Haven Line (NHL). The new interlocking lessons the impacts of the two-track rail operations needed to replace the existing WALK Bridge.

Civil construction on the interlocking began in late 2017 and was completed in fall 2022. The new interlocking was activated by Metro-North in late October 2023. 

An interlocking is a powered switch and signal system that allows trains to move from one track to another. The interlocking is approximately 3,200 feet long and is located on the New Haven Line (NHL) between East Norwalk and Westport.

The new interlocking includes six new switches and crossover tracks. The CP243 Interlocking Project includes approximately 6,200 feet of track replacement and realignment, signal and catenary modifications, including 18 catenary structure replacements, a power balancing station, and new drainage installed to the north and south of the tracks.

The CP243 Interlocking Project features upgrades the fiber optic signal system from Monroe Street, west of the Norwalk River, to a new signal hut just east of the River. This work included replacing signal houses, new connections, and mounting the signal cable on the WALK Bridge.


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CP243 Interlocking Project


Start of Construction:  October 2017

Construction Completion: Fall 2022

Metro-North Railroad Commissioning:  November 2023