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Channel Tunnel Rail Link

Structure Gauge Checks

In order to ensure trains would be able to run on the new line at full speed without the risk of getting too close to the infrastructure, a dedicated structure gauge mounted on a flat wagon was fabricated.

The gauge represents the dynamic envelope of a train running in the worst case conditions (speed, cant, etc...). The structure was then circulated at very low speed on every route and junctions and measurements were taken at each ‘hot spots’ to ensure no pieces of infrastructure would ever get into contact with a running train.

These verifications occurred late in the construction programme at a time where most if not all of the infrastructure had been installed.
During the Dynamic testing that saw the extensive use of Eurostar test trains, the structure gauge was circulated on a secured Test Track before the runs could commence to ensure nothing would infringe with the safe corridor of the train during the tests.


CTRL Section 2 Project
Entente Cordiale
Arrival of First ever Train at St Pancras International
Eurostar under the Barlow shed
Preparation on-board Eurostar before test runs
Review of CTRL-Section 2 project
Test Run on board Eurostar Test Train
Eurostar Test Train T&C Team
Eurostar test train at Stratford
Convoy of RRV
Installation of OCS equipment
Structure Gauge Checks
Gauge 'Hot Spots' checks
Test Track
View of London Tunnel
Multi-Purpose Gantry
Transition Slab & Ballasted Tracks
Multi Purpose Gantry (MPG)
Slab Track Team
Train Tunnel Ventilation Tests
Mauzin Train Tests
Michael Palin visits CTRL