RSSB2681 - T1114 - Choosing metric or imperial units for driver display on ETCS L1 & L2 overlay areas

The objectives of this project are to answer the following questions 1.

What are the implications on safety of DMI speed display units for operations in L2 in an overlay area.

This must consider: a) Unfitted trains, fitted trains driven by ETCS authorised drivers in Level 2 and non-ETCS authorised drivers operating in Level NTC b) Migration from overlay to ETCS L2 without signals areas c) Movements across boundaries between overlay and ETCS level 2 without signals areas.

2.

Identification of hazards and semi-quantified risk analysis for each DMI presentation.

3.

Which scenarios have the highest risk levels for each DMI presentation 4.

What is the impact on potential performance of not exploiting the limits of the infrastructure in Level 2 operation because of the need to operate in mph.

Ultimately, this project aims to make recommendations that Routes can apply when installing ETCS equipment, as to what presentation is safest and most feasible for their routes.

This project will require the following to be carried out: Technical review of previous safety research (Required for deliverable 1) A technical review of the previous research conducted in this area (including previous RSSB research).

The aim of this work package is to consolidate the information currently available into one report, consider the major gaps in research and use the information available to start building a risk analysis on DMI presentation in overlay areas during Level 1 and Level 2. - Consider RSSB research projects T1013 and T1091 Workshop based risk analysis (Required for deliverables 2, 3A, 3B, 5 and6) Encompass a workshop-based risk analysis of the two DMI options, considering the scenarios in the objectives, above, This workshop will: - Identify the risks associated with the two stated options on an operational railway in GB; - Carry out semi-quantitative analysis consistent with Network Rail's risk matrix to assess those hazards before and after mitigation is applied; - Identify measures to mitigate these hazards; - Determine both with and without identified mitigations, whether risk from the identified risks are likely to be controlled to an acceptable level; - Deliver the above in compliance with the requirements of legislation including CSM REA; - Make recommendations to the industry based on risk assessment.

This risk analysis will be done using a HAZID framework, in compliance with Rail Industry Guidance Note GEGN8646 and consider the following: - An ETCS fitted train will run in and out of overlay areas, encountering both ETCS fitted overlay areas (where the train could utilise either ETCS signalling or conventional signalling (where the train will be controlled with underlying national train control systems (class B) i.e. imperial units). - ETCS fitted trains will require speed information to be inputted in km/h regardless of what the DMI is presenting