Readville to Canton Junction

From the MBTA passenger station at Readville (MP 219.2), and the junction and crossovers at Transfer (MP 218.5), where the Dorchester Branch trails in on the east side, the number of tracks drops to two, and the speed limits become 95/50 on Track 1 and 100/50 on Track 2, the Main Line, CETC, overhead electrification, heads south-southwest, past the MBTA passenger station at Route 128 (MP 217.3), where the line turns south and the passenger speed limit on Track 2 drops to 95 mph, to the junction with the Stoughton Branch on the east side and MBTA passenger station at Canton Junction (MP 213.9), where the main line turns south-southwest and the passenger speed limit drops to 80 mph on Canton Junction Viaduct.