ERTMS Level 1


ERTMS/ETCS Level 1 solution for main lines (SIL4)

INTERFLO 250 is an ERTMS/ETCS Level 1 solution for main lines (SIL4). This solution comprises all the trackside products required for such a line, and also includes the automatic train protection (ATP) system, as well as the ATP system onboard the train.

The system has the following characteristics:

  • Drive on sight together with the capability of an ERTMS Level 1 ATP system

  • Automatic train protection (ATP) information through Eurobalises and Euroloop

  • EBI Lock computer-based interlocking

  • EBI Track train detection by track circuits, or axle counters

  • EBI Switch point machines controlled by interlockings

  • EBI Light by conventional, fibre optic or LED signals

  • EBI Screen control room handles train supervision

The INTERFLO 250 solution is commonly applied as an overlay to existing national ATP networks providing higher levels of safety, but providing an economical migration and early experience with ERTMS Level 1 technology. The provision and linking to an STM may be required to co-exist with existing ATP systems.

EBI Screen control room

The traffic is supervised by the EBI Screen control room system. This is a modern state of the art computer-based control and supervision system allowing the operator to give commands through a mouse or keyboard with the facility to have the position of the vehicles and optional wayside objects shown on both normal display screens and large rear projection screens.

The functionality includes:

  • Advanced CTC with flexible automatic route setting

  • Supervision and data acquisition (SCADA)

  • Passenger information displays (PIDs)

  • Closed Circuit TV (CCTV)

  • Public announcement (PA)

  • Radio communication

EBI Lock computer-based interlocking

The INTERFLO 250 solution uses EBI Lock computer-based interlocking. These interlockings can be either centralised or distributed, in which case the central unit is located in one place and the object controller units that drive the wayside objects can be located at some distance from the central unit. Dual and redundant architecture with hot standby provides high availability.

EBI Link ATP wayside equipment

In ERTMS level 1, static and variable information from the track is passed to the train through Eurobalises that are mounted in the centre of the track. The signal aspect is detected by the lineside electronic unit (LEU), which transmits the corresponding telegram to a controllable balise. The Eurobalise transmits the telegram to the ETCS onboard system during the train passage. Fixed telegram Eurobalises are mainly used to transmit static information and to serve as reference points for the trains to calibrate their position on the track. These balises give an exact position to the train as it passes and allows the train to normalise its position, reducing the position error.

EBI Track train detection

The detection of vehicles in the INTERFLO 250 solution usually occurs through axle counters, or normal track circuits, which provide continuous detection on the position of the vehicle.

EBI Switch point machines

Point machines from the EBI Switch point machine range can be used, depending on what is suitable for the particular market. Conventional or sleeper integrated point machines are used in an INTERFLO 250 solution. The point machines are operated by the EBI Lock computer-based interlocking.

EBI Light signals

The INTERFLO 250 solution uses conventional, fibre optic or LED signals. The signals are used to give the train proceed or not-to-proceed information. The EBI Light system includes mainline, dwarf, and tunnel signals.

EBI Gate level crossing

Complete level crossing systems are used in the INTERFLO 250 solution.

EBI Cab ATP onboard equipment

The onboard equipment consists of EBI Cab, which is a distributed onboard system. The ATP system onboard controls the train according to the information sent by the Eurobalises. The ATP onboard equipment ensures that the driver doesn't override the speed regulations.

EBI Tool processes & tools

The EBI Tool toolbox provides an integrated environment for adaptation, engineering, installation, test, commissioning and maintenance of an INTERFLO 250 solution.

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