Système D'aide à La Conduite, à L'exploitation Et à La Maintenance on:
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The Système d'aide à la conduite, à l'exploitation et à la maintenance (SACEM) is an embedded, automatic speed
The SACEM system enables a train to receive signals from devices under the tracks. A receiver in the train cabin interprets the signal, and sends data to the console so the driver can see it. A light on the console indicates the
Operation principles and examples with pictures in Hongkong
Embedded systems Rapid transit Railway signalling {{SouthAm-rail-transport-stub
The Système d'aide à la conduite, à l'exploitation et à la maintenance (SACEM) is an embedded, automatic speed train protection system
A train protection system is a railway technical installation to ensure safe operation in the event of human error.
Development
Train stops
The earliest systems were train stops, as still used by the New York City Subway, the Toronto subway, t ...
for rapid transit
Rapid transit or mass rapid transit (MRT), also known as heavy rail or metro, is a type of high-capacity public transport generally found in urban areas. A rapid transit system that primarily or traditionally runs below the surface may be c ...
railways. The name means "Driver Assistance, Operation, and Maintenance System".
It was developed in France
France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...
by GEC-Alsthom, Matra
Matra (an acronym for Mécanique Aviation Traction) was a French industrial conglomerate. During its years of operation, it was engaged in a wide range of business activities, primarily focused around automobiles, bicycles, aeronautics and we ...
(now part of Siemens Mobility
Siemens Mobility GmbH is a separately-managed company of Siemens, arising from a corporate restructuring effective 1 August 2018. With its global headquarters in Munich, Siemens Mobility has four core business units: Mobility Management, dedi ...
) and CSEE (now part of Hitachi Rail STS
Hitachi Rail STS SpA (from ''Hitachi Rail Signalling and Transportation Systems'') or Hitachi Rail STS (previously Ansaldo STS) is a transportation company owned by Hitachi with a global presence in the field of railway signalling and integrated t ...
) in the 1980s. It was first deployed on the RER A
RER A is one of the five lines in the Réseau Express Régional (English: Regional Express Network), a hybrid commuter rail and rapid transit system serving Paris, France and its suburbs. The line crosses the region from east to west, with all t ...
suburban railway in Paris
Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 30th most densely populated city in the world in 2020. S ...
in 1989.
Afterwards it was installed:
* on the Santiago Metro
The Santiago Metro ( es, Metro de Santiago) is a rapid transit system serving the city of Santiago, the capital of Chile. It currently consists of seven lines (numbered 1-6 and 4A), 136 stations, and of revenue route. The system is managed by th ...
in Santiago
Santiago (, ; ), also known as Santiago de Chile, is the capital and largest city of Chile as well as one of the largest cities in the Americas. It is the center of Chile's most densely populated region, the Santiago Metropolitan Region, whose ...
, Chile
Chile, officially the Republic of Chile, is a country in the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the east a ...
;
* on some of the MTR
The Mass Transit Railway (MTR) is a major public transport network serving :Hong Kong. Operated by the MTR Corporation Limited (MTRCL), it consists of heavy rail, light rail, and feeder bus service centred on a 10-line rapid transit network ...
lines in Hong Kong
Hong Kong ( (US) or (UK); , ), officially the Hong Kong Special Administrative Region of the People's Republic of China ( abbr. Hong Kong SAR or HKSAR), is a city and special administrative region of China on the eastern Pearl River Delt ...
(Kwun Tong line
The Kwun Tong line is a heavy-rail rapid transit line of the MTR network in Hong Kong, coloured green on the MTR map. Starting at Whampoa in Hung Hom and ending at Tiu Keng Leng in Tseung Kwan O, Sai Kung, the route has 17 stations and ...
, Tsuen Wan line
The Tsuen Wan line is one of the eleven lines of the metro network in Hong Kong's MTR. It is indicated in red on the MTR map.
There are 16 stations on the line. The southern terminus is Central station on Hong Kong Island and the nor ...
, Island line Island Line or Island line may refer to:
* Island line (MTR), one of the lines of the MTR metro system in Hong Kong
* Island Line, Isle of Wight, a railway line on the Isle of Wight, England
** Island Line (brand)
Island Line is a brand of the ...
, Tseung Kwan O line
The Tseung Kwan O line is one of the eleven lines of the MTR system in Hong Kong, indicated by the colour purple. It is currently long, taking 15 minutes to travel throughout the entire line.
The line runs from North Point on the Hong Kong I ...
, Airport Express
The AirPort Express is a Wi-Fi base station product from Apple Inc., part of the AirPort product line. While more compact and in some ways simpler than another Apple Wi-Fi base station, the AirPort Extreme, the Express offers audio output capa ...
and Tung Chung line
The Tung Chung line is one of the ten lines of the MTR system in Hong Kong, linking the town of Tung Chung with central Hong Kong. A part of the Tung Chung line was built along with the Kap Shui Mun Bridge and the Tsing Ma Bridge. The line cu ...
), all enhanced with ATO ATO may refer to:
Technology
*Abort to Orbit, an intact abort procedure for Space Shuttle launches
*Arsenic trioxide a potent chemotherapeutic agent for acute promyelocytic leukemia
* ATO fuse
* Automatic train operation
* Assisted take off
Milit ...
,
* on Lines A, B and 8 of the Mexico City Metro
The Mexico City Metro ( es, Metro de la Ciudad de México) is a rapid transit system that serves the metropolitan area of Mexico City, including some municipalities in Mexico State. Operated by the Sistema de Transporte Colectivo (STC), it is ...
lines in Mexico City
Mexico City ( es, link=no, Ciudad de México, ; abbr.: CDMX; Nahuatl: ''Altepetl Mexico'') is the capital and largest city of Mexico, and the most populous city in North America. One of the world's alpha cities, it is located in the Valley o ...
; and
*on Shanghai Metro Line 3
Line 3 is a north-south line of the Shanghai Metro network. Its older rolling stock carry a bright yellow colour belt to differentiate them from Line 4 trains which share a portion of its route, while the newer stock features a yellow and purple ...
.
In 2017 the SACEM system in Paris was enhanced with Automatic Train Operation (ATO) and was put in full operation at the end of 2018.
The SACEM system in Paris is to be enhanced to a fully fledged CBTC
Communications-based train control (CBTC) is a railway signaling system that uses telecommunications between the train and track equipment for traffic management and infrastructure control. CBTC allows a train's position to be known more accurat ...
system named NExTEO. First to be deployed on the newly-extended line RER E
RER E is one of the five lines in the Réseau Express Régional (English: Regional Express Network), a hybrid commuter rail and rapid transit system serving Paris, France and its suburbs. The RER E line travels between Paris and eastern suburb ...
in 2024, it is proposed to replace signalling and control on all RER lines.
Operation
The SACEM system enables a train to receive signals from devices under the tracks. A receiver in the train cabin interprets the signal, and sends data to the console so the driver can see it. A light on the console indicates the speed control
Cruise control (also known as speed control, cruise command, autocruise, or tempomat) is a system that automatically controls the speed of a motor vehicle. The system is a servomechanism that takes over the throttle of the car to maintain a ste ...
setting: an orange light means slow speed, or ; a red light means full stop. If the driver alters the speed, a warning buzzer may sound. If the system determines that the speed might be unsafe, and the driver does not change it within a few seconds, SACEM engages the emergency brake. SACEM also allows for a reduction in potential train bunching and easier recovery from delays, therefore safely increasing operating frequencies as much as possible especially during rush hour.
References
External links
Operation principles and examples with pictures in Hongkong
Embedded systems Rapid transit Railway signalling {{SouthAm-rail-transport-stub