Rolling stock, intermodal solutions, freight and infrastructure: our teams have benefited from our know-how while working for the most demanding and innovative customers in the railway world.

Passenger rolling stock

For more than 25 years, along with international manufacturers and equipment manufacturers, our teams have developed the unique know-how around the engineering and simulation of rolling stock: mechanics, CFD, thermal, acoustic and vibration phenomena. Our knowledge of scientific computing tools and our strong skills in regulation, engineering practice, instrumentation and experimentation allow us to accelerate the product development cycles by improving technical, economic and ecological performance.

CIMES is involved in the modelling, simulation and testing of all components and subsystems: cars, engines, interiors, bogies, axles, electrical and electronic systems, sanitary modules, and doors, etc.

Sièges et intérieurs
Armoires et composants électriques
Bogies, roues et essieux

Rail rolling stock

Rail transport and its relationship with other modes of transport, which have been ignored for a long time in the field of R&D, represent a huge area of research in terms of technical characteristics. Freight represents an environmentally-friendly alternative to CO2 emissions. Our expertise in numerical simulation and test engineering gives companies in this sector precise and reliable tools to develop and optimise products and services in terms of capacity, maintenance, intermodality, connectivity and sustainable development. Our operations benefit from an excellent knowledge of the physical, technical and regulatory constraints of freight: they provide our customers with effective and expert support, which leads to increased competitiveness and profitability.

Wagon citerne
Wagon trémie
Wagons porte auto
Wagon de chantier
Wagons intermodaux


Investment and resource savvy, railway infrastructure engineering represents a very significant cost reduction potential. Numerical simulation makes it possible to develop and validate concepts while reducing costs, whether by reducing thicknesses, limiting fatigue and wear of tracks, or facilitating maintenance. It also helps to provide carriers with the vibrational and acoustic comfort, required by the rules and the market. Finally, it is an essential tool for ensuring transport safety and enabling the introduction of new technologies for optimising track capacity in complete safety.

Simulation multi-corps
Ouvrages d'art
Interaction pantographe/caténaire

Our actions

Initial design and lightweight design

  • Research of innovative structural concepts
  • Multimaterial vehicles (steel, aluminium, composites)
  • Welded, riveted, bolted or glued joints
  • Modelling automation

Railway dynamics via multibody studies

  • Dynamic behaviour
  • Pantograph and catenary interaction
  • Traveller comfort
  • Safety and quality of operation (left-hand passage B55, left of construction site)
  • Fatigue, wheel wear and infrastructure

Crash and docking studies

  • Complete units
  • Wagons
  • Subassemblies (energy absorbers, tie rods, buffers)

CFD, external and internal aerodynamics, heat exchange

  • Deflector studies
  • Thermal studies of electrical equipment
  • Aeraulic studies of equipment on the roof and under the vehicle
  • Determination of aerodynamic forces on transported vehicles
  • Simulation of fire on railway vehicles or tunnel fire
  • Internal thermal and acoustic comfort
  • Effects of train passage through tunnels
  • Noise of passage (noise mapping)

Online tests and bench tests

  • Establishment of test specifications
  • Establishment of gauge plans
  • Design of trial assemblies
  • Test follow-up
  • Correlation of test calculations

Respect of norms and standards

  • Dimensioning of rail vehicle structures
    EN 12 663-1, EN 12 663-2
  • Dimensioning civil engineering structures
    Eurocodes and DAN
  • Noise measurements of vehicles travelling on rails
    ISO 3095
  • Fire Engineering
    NF EN 50 553
  • Railway dynamics and comfort UIC 518, NF EN 12 299
  • Interiors
    EN 12 663-1 UIC file 566
  • Seats
    NF F 31-119
  • Embedded equipment
    IEC 61 373
  • Track equipment
    NF EN 50 125-3
  • Bogies
    NF EN 13749, NF EN 14 531-6, NF EN 15 437-1, ERRI B12 / RP17, Eurocodes, DVS or BS, IEC 61 373
  • Wheels and axles
    NF EN 13979-1, NF EN 13 979-2, NF EN 13 103, NF EN 13 104, UIC File 510-2
  • Screwed and welded joints
    NF E 25-030-1, Eurocodes 3 & 9, Fatigue of steel and aluminium structures