Will HS2 use TVM430?

[Bald Rick]

Is it correct that TASS isn’t compatible with ETCS?

TASS uses the Eurobalise For positional information. In my (very simple) mind, it’s a relatively straightforward software issue.

 

[zwk500]

TASS uses the Eurobalise For positional information. In my (very simple) mind, it’s a relatively straightforward software issue.

This RSSB Report: https://consultations.rssb.co.uk/_entity/sharepointdocumentlocation/eba36637-38a2-ed11-aad1-000d3aba3d81/2ab10dab-d681-4911-b881-cc99413f07b6?file=04. RIS-0799-CCS issue one.pdf
Suggests it's more than that:

4.6 Tilt Authorisation and Speed Supervision (TASS)
4.6.1 Guidance for TASS
Guidance
G 4.6.1.1 The ETCS integration requirements for TASS systems are not defined in the CCS NTSN, there are limited national standards for TASS with those in place covering the basic principles of the system. When TASS was originally introduced, it followed the draft ETCS standards for track train interface in place at the time; the finalised ETCS track train interface standards now in place have deviated from those used for TASS. For this reason, there is no simple integration path for ETCS and TASS on existing TASS fitted fleets operating on existing TASS fitted infrastructure.

G 4.6.1.2 Options for integrating TASS with ETCS include:

Spoiler

a) Stand-alone - no integration between the two systems; TASS remains a standalone system with no interface to ETCS
b) Connected - partially integrated into the ETCS, with a minimum requirement to integrate 'TASS Healthy' status to drive cant deficiency ETCS train data; and
c) Integrated - fully integrated with all TASS functionality included within ETCS.
G 4.6.1.3 The implications of the integration options include:
a) For stand-alone, TASS may be using a different most restrictive speed profile (MRSP) when degraded to that used by ETCS with the change of cant deficiency data only taking place when the train driver changes the ETCS train data.
b) For connected and integrated, when the 'TASS Healthy' status changes, the train is braked to a stand to allow the train driver to validate the updated cant deficiency ETCS train data.
G 4.6.1.4 Whichever level of integration of TASS and ETCS is selected, a full risk assessment and operational review is carried out to identify all issues and apply mitigations as required.

 

[MarkyT]

TASS uses the Eurobalise For positional information. In my (very simple) mind, it’s a relatively straightforward software issue.

TASS is a custom system using standard track balise and train reader hardware. The special data is in 'packet 44' of the messages from track and train which is the correct method and there's a Railway Industry Standard covering management of P44 systems which also include the Thameslink ATO implementation. Equipment onboard Pendolinos would need a big update for full ETCS capability but the balise reader might plausibly be reused. I expect in a full ETCS scheme there would be no need for the special TASS-dedicated balises as the EPS information could be encoded in other ways, along with the standard speed limits.

This RSSB Report: https://consultations.rssb.co.uk/_entity/sharepointdocumentlocation/eba36637-38a2-ed11-aad1-000d3aba3d81/2ab10dab-d681-4911-b881-cc99413f07b6?file=04. RIS-0799-CCS issue one.pdf
Suggests it's more than that:

Spoiler

a) Stand-alone - no integration between the two systems; TASS remains a standalone system with no interface to ETCS
b) Connected - partially integrated into the ETCS, with a minimum requirement to integrate 'TASS Healthy' status to drive cant deficiency ETCS train data; and
c) Integrated - fully integrated with all TASS functionality included within ETCS.
G 4.6.1.3 The implications of the integration options include:
a) For stand-alone, TASS may be using a different most restrictive speed profile (MRSP) when degraded to that used by ETCS with the change of cant deficiency data only taking place when the train driver changes the ETCS train data.
b) For connected and integrated, when the 'TASS Healthy' status changes, the train is braked to a stand to allow the train driver to validate the updated cant deficiency ETCS train data.
G 4.6.1.4 Whichever level of integration of TASS and ETCS is selected, a full risk assessment and operational review is carried out to identify all issues and apply mitigations as required.

Interesting thanks. I wonder how other European administrations permit higher speeds when tilting. The UK is not the only country to use such trains.