When it is needed
When a particular fault, work quality or consistency of event logs needs to be checked.
What we examine
- Signalling, interlocking and block equipment
- Diagrams and settings
- Event logs
Materials to prepare
- As-built drawings
- Equipment documentation
- Original logs
- Maintenance and modification records
Sample questions
- Which events are supported by the logs?
- Do the diagram and supplied settings agree?
- What changes preceded the fault?
- Are the data sufficient to check the explanation of failure?
- What additional information is needed?
How the work is carried out
- Inventory of the configuration and sources
- Comparing diagrams and events
- Checking the technical explanation
Result
A report with a verifiable chronology and analysis of particular circumstances of system operation.
What affects the conclusions
Changing settings, intervening in an operating system and controlling traffic are outside a documentary examination.
Frequently asked questions
Can exported logs be examined?
Yes, where their origin, format and time system are clear.
Do you change settings for an experiment?
All operations are considered separately and performed only by authorised personnel under an agreed programme.