Westbury Aggregates Terminal
Last updated 25 May 2026
Wiltshire cement and aggregates terminal cluster on the Reading–Taunton line. Tarmac sidings, the BR Down and Marshalling yards, and the Westbury Wilts reception handle stone outbound from the Mendip quarries to the south-east and inbound cement materials. Carried by Heavy Haul Rail, Colas Rail, DB Cargo, and GB Railfreight in roughly even shares.
Westbury Aggregates Terminal website
| Operating company | Network Rail (yard infrastructure); Tarmac (aggregates terminal) |
| Commodity | Limestone aggregates outbound; cement and stone materials inbound |
| Active since | Yard infrastructure long-established; Tarmac terminal operational from the 1980s |
| Rail connectivity | Reading–Taunton main line; Westbury East and West junctions; private Tarmac terminal |
| TIPLOC footprint |
WSTBLAF
(Westbury Tarmac terminal)
WSTBRDY
(Westbury BR Down Yard)
WSTBRUY
(Westbury BR Marshalling Yard)
WSTBRYW
(Westbury Wilts reception)
|
| Carrier mix |
Heavy Haul Rail
(33%)
Colas Rail
(26%)
DB Cargo
(21%)
GB Railfreight
(17%)
|
| Trailing 12-period A2F | Inaugural data window — per-period reliability figures from P1 2026-27 onwards. |
Latest period summary
Westbury Aggregates Terminal handled 135 monitored inbound services and 138 monitored outbound services in Period 2 2026-27. Inbound arrivals read 88% within 15 minutes of schedule against a national freight benchmark of 90%; outbound services read 85% within 15 minutes. The +2 percentage-point move on Period 1 2026-27 inbound and the -7 percentage-point move outbound sit within plausible sampling variation at these denominators; the ranges around each reading overlap. PRELIMINARY at T+2; FINAL re-publication at T+35 after Network Rail's batch correction.
Reports
Carriers active
Corridors served
Methodology & sources
All figures derive from Network Rail's NROD TRUST feed, processed via the Gauge Intelligence ingest pipeline. Period definitions, A2F (Arrival to Fifteen), the Wilson 90% interval, daily anomaly rules, cross-view reconciliation, and delay attribution are documented at:
Data window — period boundaries and the data-as-of cutoff
League tables — cross-view reconciliation across the four analytical views
Anomaly detection — daily A2F SPC rules
Delay attribution — DAPR cause-code breakdown
Forecasting — prediction intervals and possession-exposure estimates
Westbury is the Wiltshire interchange that connects the Mendip aggregates quarries to the south-east and London markets. The yard sits on the Reading–Taunton line at the southern edge of the Westbury White Horse, immediately west of the station, and is the principal staging point for aggregates traffic out of Somerset.
Activity window
Across the 90 days to 25 May 2026 the published archive observed 510 inbound and 552 outbound journeys at the Westbury cluster (queried gauge_intelligence_v2 at 2026-05-25, 90-day window). Heavy Haul Rail carried around 33% of journeys; Colas Rail around 26%; DB Cargo around 21%; GB Railfreight around 17%. Per-period reliability data for this site, once a closed-period window is available, will be published in the next quarterly archive edition. Corrections and additions welcomed via [email protected].
Methodology
Carrier and footprint figures are computed from Network Rail TRUST data, attributed by destination and origin TIPLOC. See the league-table methodology for the attribution rules, the data-window methodology for the period boundaries, and the supply-chain entity methodology for the entity classification and bundling rules.
Carrier labels reflect the current operating entity, not the current TRUST attribution. Network Rail issued a distinct toc_id for Heavy Haul Rail in late February 2026 following the 29 January 2026 split of the Freightliner Group, but re-coding of in-flight bulk traffic from the historic Freightliner toc_id is still in progress; at this archive’s published data window the majority of bulk haulage at Westbury continues to flow under the legacy code. The shares above describe the operator that runs each journey, not the TRUST code under which it appears.
Inaugural data window
This register entry covers identity and rail-freight footprint only. Per-period reliability figures — arrival-to-five-minute pass rate, cancellation rate, intraday pattern — publish from the first full closed rail period that completes under the current attribution model. Until that period closes, footprint counts are the only figures on this page.
Partial carrier attribution
Footprint counts on this page reflect the freight operators whose TRUST activations resolve to this site's TIPLOCs. Movements handled outside the named carriers — internal shunts, non-NROD-reporting operators, or flows attributed to network nodes rather than the site itself — are not captured here. Where the rail-served footprint is shared between several occupiers, the named carrier may not be the contracting party.