Signalling of the Milan Metro

The Milan Metro subway system is managed by a single ATM control centre, built in 2013 by Alstom.[1]

Garibaldi station from Milan's Metro System with an ATM class 1500 tram

Lines 1 and 2
An FS like signal in Crescenzago station

Line 2 uses a speed signaling system. Trains are directed using a semaphore system, which has five states:

  • Imperative red: The train must stop.
  • Permissive red: The train can go on with a maximum speed of 15 km/h (9 mph) and must stop in case of danger. Physically, it's represented by a fixed or flashing "P" under the semaphore.
  • Red-yellow: The train can reach 30 km/h (18 mph).
  • Yellow: The train can reach 50 km/h (31 mph).
  • Green: The train can reach the line's speed limit: 85 km/h (53 mph) for the red line and 75 km/h (47 mph) for the green line.

Before 2011, Line 1 used this same system, but now uses a new signaling apparatus. The signaling apparatus permits a 90-second frequency on the line, similar to the one used on the M3 line. The speed of the train is decided by an ATC system and a two-color semaphore system. [2]

The two-color semaphore system has three possible states:

  • Red: Imperative red.
  • Red and white: Conditional green.
  • White: Green.

Line 3

Line 3 has an ATO/ATP system, so the driver must only check the doors and give consent to the electronic system to start the train.[3]

Line 5

Line 5 uses AnsaldoBreda Driverless Metro, consequently the line does not have classical light signaling. Automatic signaling permits a frequency of a train every 75 seconds, but today only a 90-second frequency is used.[4]

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gollark: Hmm. Apparently,> Right-wing politics embraces the view that certain social orders and hierarchies are inevitable, natural, normal, or desirable,[1][2][3] typically supporting this position on the basis of natural law, economics, or tradition.[4]:693, 721[5][6][7][8][9] Hierarchy and inequality may be seen as natural results of traditional social differences[10][11] or competition in market economies.[12][13][14] The term right-wing can generally refer to "the conservative or reactionary section of a political party or system".[15] Obviously, generics should exist in all programming languages ever, since they have existed for quite a while and been implemented rather frequently, and allow you to construct hierarchical data structures like trees which are able to contain any type.
gollark: Ah, I see. Please hold on while I work out how to connect those.
gollark: I refuse. I don't know exactly how it will look on your screen, and I can't write it with RTL characters due to Discorduous limitations and English.
gollark: That is left-justified.

References
  1. "Nuova sala operativa Metrò Atm via Monte Rosa 14 novembre 2013". milanotoday.it. Retrieved 2018-11-28.
  2. "Linea M1, nuovo sistema di regolazione della circolazione". atm.it. Retrieved 2018-11-28.
  3. "Linea M3 – metropolitana di Milano". Sitabus.it. Retrieved 2018-11-28.
  4. "Metropolitane a Milano – Linea 5". Metropolitana Milanese. Retrieved 2018-11-28.

See also
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