6 October 2017

The Nimes-Montpellier Bypass Undergoes a Series of Tests

Following its contributions to the SEA and BPL high-speed lines, Eurailtest now has the further task of performing tests on the Nimes and Montpellier bypass (CNM), in behalf of SYSTRA and SETEC Ferro.


The bypass has been put through its paces in a full range of tests designed to ensure maximum compatibility with its environment.

Tests began in December 2016 with runs at low speeds (verification of track geometry with a Mauzin recording car). Then, in early June, between the Mediterranean high-speed line (MED HSL) and the new Montpellier-Sud-de-France station, Eurailtest conducted a series of Lucie-Vulcain tests on traction return currents, speed control (KVB) balises and track circuits. Further tests concerned soil resistance and detailed electromagnetic compatibility studies. These were followed by speed ramp-up tests with a dedicated high-speed (TGV) trainset, suitably equipped for the purpose by Eurailtest member laboratory, AEF.

At the same time, a number of additional tests were agreed and carried out in early July: electromagnetic compatibility with a gas line and the ORANGE telephone network, electromagnetic compatibility in accordance with the EN 50121-2 standard, ground-to-rail voltage tests to ensure staff protection, overhead contact line uplift measurements, ETCS Level 1 signalling qualification tests.

CNM is a project consisting of 60 km of new line with 5 connections to the existing network. The technical resources deployed are as extensive as those required for the SEA HSL, which comprises 300 km of line and 10 connections.