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Line S9 (Milan suburban railway service)

Saronno–Albairate-Vermezzo
S9
An S9 train at Milano Lambrate.
An S9 train at Milano Lambrate.
Overview
Type Commuter rail
System Milan suburban railway service
Status Operational
Locale Milan, Italy
Termini Saronno
Albairate-Vermezzo
Stations 15
Website Trenord (Italian)
Operation
Opened 2004
Technical
Track gauge 1,435 mm (4 ft 8 12 in)
Electrification 3,000 V DC
Route number S9
Route map
Map of line S9.

The S9 is a commuter rail route forming part of the Milan suburban railway service (Italian: Servizio ferroviario suburbano di Milano), which converges on the city of Milan, Italy.

The route runs over the infrastructure of the Novara–Seregno, Milan–Chiasso, Milan belt, Milan southern belt and Mortara–Milan railways. Like all but one of the other Milan suburban railway service routes, it is operated by Trenord.

Line S9, a cross-city route, heads initially in an southeasterly direction from Saronno towards Cesano Maderno, Seregno, Monza and Milano Greco Pirelli, then runs via the Milan belt line and southern belt line around the eastern and southern sides of the Milan city centre, before finally heading southwest, to Albairate-Vermezzo.

The S9 commenced operation on 24 December 2004, and initially linked Seregno with Milano San Cristoforo. Unlike the other lines in the suburban railway service, which offered services at half-hourly intervals, the S9 ran at a frequency of only one train per hour, in a narrower time band (from 07:00 to 20:00).

Thanks to the activation of the S9, local passenger trains returned to the southern belt line after an absence of 10 years. Another peculiarity of the line was that it was the only one in the suburban railway service not to run along the Passante railway.


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