Click below to consult the terms in the lexicon.

Call for tenders

The procedure for concluding a public procurement contract in which the tender is awarded to the contractor or service provider who has submitted the most economically advantageous regular bid from the public company’s point of view.


Bringing into commercial use a line or specific technical installation (permanent structure, etc.) for the purposes of operating train services.

Computer Aided Design (CAD)

Developing two or three-dimensional models using computer programs (AutoCAD, CAD/CAM, STAR) in order to replace or complement the designs which are still produced using drawing boards.

Connecting bend

Bend connecting two railways or a railway and a station.

Construction Contract Manager (CCM)

Responsible for coordinating and managing the order and the worksite, monitoring progress and ensuring compliance with the objectives from the beginning to the end of the project, supervising, following up and checking the quality of the work carried out by the contractor; key person for all quality, environmental and safety aspects related to the completion and delivery of the site; manages all the documents necessary for the execution of the order from the beginning to the final delivery.

Continuous welded rails

Rails welded to each other at a length of 300 metres. The absence of joints in continuous welded rails ensures more comfort on the ride and less noise pollution.

Covered cutting

Civil engineering work covering the railway line entirely. Unlike a tunnel which is dug through the ground, a covered cutting is done by first constructing the side walls, then the new concrete slabs. Afterwards the earth is cleared away under these new slabs. Finally the roof of the cutting is undertaken. The upper slab can then be fitted out according to need (hard surface, earth covering,…).