New Haven to New London/Groton

From the multi-island platform passenger station at New Haven (MP 72.3), where passenger trains headed for the Springfield line switch from electric to diesel haulage (and those for Boston did until 2000), with both Amtrak and Metro-North shops on the southeast side of the line, the three-track, CTC, line, with speed limit 15 mph for passenger trains and 10 mph for freights, continues past MP 72.5, where the speed limit for passenger trains also falls to 10 mph, crossovers at Fair Street (MP 72.7), the Division Post (MP 72.8), where Metro-North ownership ends and Amtrak ownership starts, and speed limits rise to 35/20, and the junction at Mill River (MP 73.6), where the double track, CTC, Springfield line continues northeast and the double track, CTC, overhead electrified Boston line turns sharply south and speed limits rise to 70/20, past the bridge over the river, turning southeast past Shore Line Junction (MP 75.2), where the freight speed limit on Track 2 rises to 25 mph, and then east past East Haven, and MP 77.0, where the freight speed limit rises to 40 mph.

There are detectors at MP 79.0, the passenger station at Branford (MP 81.5), MP 82.0, where the speed limit rises to 90/45 on Track 1 and 80/40 on Track 2, a track leaves on the north side and then curves to pass beneath the line, a turn east-southeast, east-northeast past Guilford (MP 88.9), and east again, past East River, the passenger station at Madison (MP 93.1), MP 95.0, where the speed limit becomes 85/50 on both tracks, the passenger station at Clinton (MP 96.7), MP 101.0, where the passenger speed limit rises to 90 mph on both tracks, the passenger station at Westbrook (MP 101.2), a turn east-northeast past the junction at Brook (MP 103.6), where the Valley Railroad departs on the north side and there is an extra track (speed limit 15.10) as far as Old Saybrook, and the passenger station at Old Saybrook (MP 105.1), where the freight speed limit is 45 mph on Track 1 and 20 mph on Track 2, with the latter rising to 30 mph east of here.

The line crosses the Connecticut River on the multi-span through truss movable bridge at Conn (MP 106.8), where the speed limit is 75/40 on Track 1 and 75/20 on Track 2, rising to 75/40 and 75/50 to its east, and turns east-southeast, past Lyme & Black Hall, detectors at MP 107.9, and MP 109.0, where the freight speed limit on Track 1 rises to 50 mph, and then east-northeast, past East Lime, Point (MP 115.0), MP 115.8, where the freight speed limit on Track 2 drops to 20 mph, and the movable bridge over the Nantic River at Nan (MP 116.7), where the speed limit is 60/30 on Track 1 and 60/40 on Track 2, with the freight speed on Track 1 rising to 40 mph to its east to Millstone, turning east-southeast pastWaterford (MP 119.7) and the road crossing at Miners Lane (MP 120.2), and then sweeping around to the north-northeast, past the movable bridge at Shaws Cove, where the speed limit drops to 25 mph, the junction with the Central Vermont on the east side at Shaws Cove (MP 122.5), the road crossing at Bank Street (MP 122.5), the road crossing at State Street (MP 122.8), the passenger station at New London (MP 122.9), and the road crossing at Governor Winthrop Boulevard (MP 123.0), turning north-northwest and climbing as it turns east to the multi-span through truss movable bridge across the CV line and then the Thames River and the wye junction with the Providence & Worcester's Norwich Line on the north side at Groton (MP 124.2).