Data Sources
Data Sources
SS Elements are sourced directly from Ellipse, with historical assets recoded where required to use the correct element type. Improved EGI-code mapping identifies more assets and associates them with the appropriate SICA element types. ALCRM level crossings are imported into DataStore, supporting SSADS and ALCRM mapping.
WT7x Interlocking Renewal Data
WT75, WT78 and WT75+78 are the new life-extension work types used by the new renewal policy:
| Work type | Planning use | Renewal work type replaced | Cost basis |
|---|---|---|---|
| WT75 | Interlocking life extension | WT03 | WT65 |
| WT78 | Control-system life extension | WT12 | WT68 |
| WT75+78 | Combined mechanical interlocking and control-system lever life extension, including mixed technology on the same date | WT15 | WT65 + WT68 |
The legacy work types remain available, and older policy and cost-data-set versions are unchanged. In the new cost data set, the WT7x work types use a single SEU item rather than a separate small-scheme allocation.
Level Crossing Data
Level crossing packages come from 3 different sources.
- Automated full renewals come from the TRD (Target Renewal Date). This is derived from the commissioning date of the asset, the ERD (Engineer's Renewal Date) and SICA assessments.
- Automated recontrol suggestions are based on interlocking area recontrols (including full resignalling from WT02 , DR20 etc).
- Manual scheduled work banks which were provided at the start of CP7.
Small Scheme Costs
Small Scheme Costs were applied to the following legacy work types:
WT02, WT03, WT11, WT12, WT16, WT41, WT65, WT67, WT68, WT90, WT91, WT92, and WT99.
The new WT75, WT78 and WT75+78 cost configuration does not use a separate small-scheme allocation.