RI-tech s.r.o. > Products > Railway > Rolling stock > Onboard systems > Train Protection and Warning System (AWS / TPWS)

Train Protection and Warning System (AWS / TPWS)

The current Network Rail UK protection systems are TPWS and AWS. The functionality of both systems is combined in a single system, generally referred to as TPWS. TPWS comprises of OSS (Overspeed Sensor System) and TSS (Train Stop System).

The OSS system automatically applies the vehicles emergency brakes when the vehicle exceeds the posted speed over an active OSS transmitter. The TSS system automatically applies the vehicles emergency brakes when the vehicle passes an active TSS transmitter installed at stop signal. AWS gives train drivers an audible and visual indication of the status of the signal ahead. If the driver does not acknowledge the indication of a caution signal the AWS system automatically applies the vehicles emergency brakes.

Mors Smitt TPWS system is based around a TPWS Control Unit to which all other AWS and TPWS equipment is connected. For simplification however, the complete train borne TPWS system can be split into four distinct elements, these being the Control Unit, AWS Receiver, TPWS Antenna and Cab Controls and Indicators. Included Specific Transmission Module (STM) is aimed to manage the interface between existing national train protection systems and ETCS to provide continuous train operation on sections not covered by ETCS.

Mors Smitt TPWS is ready for both Isolated Speed Limited Authority (ISLA) and Radio Based Limited Supervision (RBLS). Isolated Speed Limited Authority (ISLA) is a future TPWS development which will provide:

  • Line speed supervision
  • Temporary Speed Restriction (TSR) and Emergency Speed Restriction (ESR) remote deployment and supervision
  • Possession boundary control/supervision
  • Controlled/supervised moves through possessions
  • User Worked Crossing safety enhancements

Radio Based Limited Supervision (RBLS) is a future development based on core principles of ETCS and TPWS to provide:

  • Signal aspect supervision
  • Continuous supervision benefits at a fraction of the cost of ETCS
  • Relatively quick and low-cost vehicle installation compared to ETCS
  • Minimal driver training required, as based on familiar TPWS control panel

Download:

TPWS and AWS Flyer

  • AWS Alarm and Indicator

     The STS AWS Alarm and Indicator Unit is part of Network Rail's Automatic Warning System and has been in use since 1983. The Unit meets the requirements of Network Rail Group Standard GE/RT8035 and is manufactured to the requirements of British Railways Specification TEE/E/8/R/39. It provides: Audible outputs to indicate 'Clear' or 'Caution' signals. An electronic 'chime' for Clear aspect and a continuous tone for signals at 'Caution' A visual…

  • AWS and TPWS Test Equipment

     Mors Smitt can supply all necessary test equipment to ensure the vehicle interfaces correctly with the track equipment. This test equipment is used to ensure that the installation complies with the relevant standards throughout the life of the vehicle.Mors Smitt can supply first of class characterisation, commissioning and maintenance testing equipment.

  • AWS Indicator / “Sunflower”

     The AWS Indicator (or sunflower) is mounted in the cab in the drivers field of vision whilst looking at the track ahead. It shows the status of the last AWS signal received by the TPWS Control Unit.

  • AWS Receiver

     Manufacturing Ref TY294. The electronic AWS receiver forms part of the sensing circuit of the AWS system. The receiver is manufactured using a glass reinforced polymide material to provide good impact making the unit suitable for mounting on the bogie of high speed trains. A flexible metal screened conduit with multipole bayonet connector enable ease of installation and good environmental protection. The unit is mounted using four M12 fixings.

  • TPWS Antenna / Aerial

     STS Manufacturing Ref. TY255 The TPWS Antenna is part of the sensing circuit of Train Protection and Warning System complying with the requirements of Network Rail group standard GE/RT8035 The Antenna is manufactured using a Kevlar reinforced polymer material that provides good impact resistance making the unit suitable for mounting on the bogie of high speed trains. An integral stainless steel braided conduit with multipole bayonet connector enables ease of…

  • TPWS Control Unit

     As Network Rail prepares to rollout ETCS across its network, work is also starting to deliver rolling  stock that is compatible with the new system. All  new trains currently on order for the UK will be ETCS-ready, and the initial steps to upgrade some existing fleets have been taken. (more…)

  • TPWS Driver Machine Interface (DMI)

     DMI available in a panel option or digital visual display unit on a single touchscreen. All new vehicles entering service must now be fitted with an upgraded version of TPWS to GE/RT8030 Issue 4 and part of this upgrade is the addition of a DMI. The DMI is mounted in the driver's desk as required by location of primary controls rules.