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The challenge Capital of Taiwan with around 6.8 million inhabitants for the metropolitan area, Taipei City started planning its metro network in the 1970s, the construction in 1980s and progressively the revenue services in 1990s.

Nowadays, a network of 9 lines with 93 km and 80 stations is completed and put into revenue service, carrying about 1.4 mil-lion passengers daily, and about 60 km and 50 stations are under construction. Further more, about 120 km with 115 stations are planned to be constructed in the future.

The Neihu Line In 1996, the first line of the Taipei metro network to be put into commercial operation is the Mucha Line (Brown Line), an elevatedMedium Capacity Transit system (VAL). As part of the 2nd stage network, the Neihu Line is an extension of the Mucha Line.The Neihu Line starts north from the existing elevated terminal station BR2. The line then goes down into tunnel to the Sungshandomestic airport with BR1 station, it turns north under the airport and Keelung River and re-emerges after B1 station. The Neihu Line continues east by viaducts crossing Neihu District to reach the terminal and depot in Nankang. There a connection is made to Nankang Line.The system definition, as well as the design of the civil works, track and depot has been carried out between 1999 and 2002. The construction has started in 2003. The revenue service began in July 2009.

stations and depotThe Neihu Line includes 12 stations, of which 2 are underground and 10 elevated. A maintenance depot is located in Nankang.

infrastructure The total length of Neihu Line is about 15 km, including 4 km under tunnel and 11 km on viaduct. One of the key issues of this project is to minimize the mass of the structures, for a better insertion of the line in the dense urban area and to reduce the environmental impacts. For the first time in Taiwan, the Department of Rapid Transit Sys-tems (DORTS) has adopted the U Shape viaduct. This design was developed and proposed by SYSTRA as an optimised solu-tion to elevated metro systems.

superstructureThe tracks consist of steel running surface. The rolling stock and train control systems are from Bombardier Transportation with certain compatibility with the existing VAL system of Mucha Line (the new rolling stock should be able to run on the existing run-ning surface of Mucha Line and the existing rolling stock of Mucha Line should be able to run on the Neihu Line), using rubber tired driverless AGT technology with Communication Based Train Con-trol (CBTC) system allowing a minimum headways of 72 seconds.

SYSTRAs roleSYSTRA has already been deeply involved in the Mucha Line at the beginning of 1990s. At the time, SYSTRA carried out the coordination between E&M systems and civil works and ensured the training of operation and maintenance staff of the line.Within the frame of Neihu Line, SYSTRA has taken the role of Special Design Consultant for the local designers of the De-partment of Rapid Transit System (DORTS) of Taipei Municipal Government. SYSTRA performed the following services:System-wide assistance, including: definition of the system-wide requirements and interfaces

between systems and civil works, power supply simulation of the whole line, noise & vibration studies and recommendations to mitigation

solutions.

Viaduct designCompared to the traditional box girder viaduct, the U Shape viaduct is an optimised solution to elevated metro systems, which allows reducing significantly the visual impact to urban environ-ment, as well as the cost duration ratio.

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To improve the construction quality and speed, the typical U shape spans as well as the pier caps are fully pre-cast.Within this project, SYSTRA has performed: basic and detail design of the typical sections of U Shape

viaducts, architectural design of the typical U shape structures (supers-

tructures and substructures), design assistance for special bridges, detail design review.

Running surface design, including: functional specifications, basic Design.

Depot design: general layout and basic design, detail design review.

facts and figures Length: 15 km (4 km tunnels, 11 km viaducts)

Number of stations: 12 (2 underground and 10 elevated)

Number of depot: 1

System type: rubber tired AGT driverless with CBTC

organisations involvedOwner: Department of Rapid Transit Systems (DORTS)Operator: Taipei Rapid Transit Corp. (TRTC)Contractors: KSECO/Bombardier Transportation, Continental, Pan Asia

costGlobal: about 1,170 million US$

financingCentral Government : 75%Municipality : 25%

key datesJuly 1999: starting of the Detail Design

August 1999: contract of assistance system (for the lot 144 with CECI)

June 2001: - contract for the U Shape viaduct and assistance system for the lot 145 (with CECI).

- contract of assistance to the depot design (with RESI)

January 2003: contract for the rubber tired AGT driverless basic design (with CECI and RESI)

May 2003: starting of the turnkey construction contract for U Shape viaduct and systems

July 4, 2009: commissioning of the Neihu line

at a glance

BR2BR1

B1 B3B4

B5

B6 B7

B8

B9

B10

B11

B2Neihu Line

Mucha Line