Page 47 - BTSGroup ONE REPORT 2021/22_EN

BTS Group Holdings Public Company Limited 2.3 MOVE 45
Annual Report 2021/22

To accommodate the increasing ridership in both the Green Line Core Network across carriages. The wheels are equipped with rubber wheels with 8 wheels
and its extensions (Silom Line and Sukhumvit Line), BTSC has added 52 more per car train. The wheels are equipped with a run flat protection device to
trains to its fleet. Each train now consists of four-car trains and are able to ensure the safety of passengers while using the service.
carry up to 1,490 passengers (168 sitting and 1,322 standing). The details
of the trains added to the fleet are as follows: (i) 12 four-car trains, acquired All Gold Line rolling stocks are operated by using Unattended Train Operation
from CRRC, added in February 2011; (ii) 35 single-car trains acquired from (UTO) or manual ATP mode (MATP) with Vehicle Automatic Train Operation
the Siemens Group added to existing trains, converting the existing 35 three-car (VATO) system to control the operation. Thus, there will be no driver in this
trains to four-car train in May 2013; and (iii) 5 four-car trains acquired from system.
CRRC added to the fleet in December 2013.

(ii) Signalling System
In addition, in May 2016, BTSC entered into an agreement to procure The signalling system was designed to provide safety and efficiency in the
46 additional four-car trains with relevant equipment from the Siemens Group train system’s operations. It relies on the internet protocol-based network and
and CRRC, at the cost of approximately EURO 270mn (excluding VAT) to sends the control signal through a wireless communication system (WiFi) to
accommodate the increase in ridership in the aforementioned Green Line the trains in two-way communication, in which the data is relayed and sent
network, including the Northern and Southern Green Line extensions. As to the control centre. In addition, the system also utilises fibre-optics to relay
such, the fleet currently consists of 98 trains in service. Out of the 46 new traffic-related data to the traffic control centre. The signalling system features
trains, 22 trains were from the Siemens Group while the remaining 24 trains a fail-safe and a hot standby, whereby the trains can be operated safely in
were from CRRC. any direction or route at normal speeds in case of disruption.

Gold Line rolling stock Following incidents of the service disruption in 2018, in which the signalling
In December 2020, BTSC commenced operation of the Gold Line. It connects system failed and caused the disruption throughout the entire train operations,
to Krung Thon Buri Station of Silom Line by using 3 trains, all produced by the failure in the signalling system was caused by a malfunctioning network
Puzhen Bombardier Transportation System (PBTS). Each train consists of switch creating network data loops and causing the system to crash. Afterwards,
two-car trains with a total capacity to carry up to 352 passengers (38 sitting BTSC has improved the network system to resolve the issue by limiting the
and 314 standing). The train runs on AC motors, receiving electricity from the firewall zone, allowing the operations in other areas to continue in case of
power supply rail and connects to the ground system via the ground rail which disruption if the network system has problems in a particular area. In order
is located in the middle between the running path. The maximum train speed to maximise data transmission accuracy and speed, BTSC also proceeded to
is 80 kilometers per hour, whilst the average train speed in service, including change the radio transmission system from that of Motorola’s to Moxa Radio’s,
time for passengers boarding the trains, is approximately 21 kilometers per transmitting between wireless equipment with a roaming control device to
hour. Each car train is equipped with 4 sets of seats along its length and 2
air-conditioning units. There is no connection point for passengers to walk