About New Joules Engineering North America

  • New Joules Engineering was established in 1987 in South Africa, and established it’s North American facility in Kansas City in 1995.
  • The company facilitates all design, manufacturing, service repair, and supply, of the Joule Piston Retarder systems.
  • New Joules Engineering has its main manufacturing plant in Kansas City (USA), and Port Elizabeth (South Africa), and is supported by a strong supply infrastructure. All manufacturing, assembly, calibration and service repair is done by New Joules Engineering.
  • New Joules Engineering North America is part of the Argent Industrial Ltd. Group of companies.


The Joule Piston Retarder is used in Class 1 railroads across North America such as Union Pacific Railroad, Canadian National, and BNSF. The retarders are also in use in South Africa and Mozambique.

Joule retarders are currently in use in the following yards.

New Joules Engineering
North America

  • Roseville Sacramento California,
  • Argentine Kansas City Missouri,
  • Hinkle Oregon,
  • Livonia Baton Rouge Louisiana,
  • Beaumont Texas,
  • Settagast Houston Texas,
  • Little Rock Arkansas,
  • Dallas Texas,
  • Strang Houston Texas,
  • Balmer Seattle Washington,
  • Neff Kansas City Missouri,
  • Memphis Tennessee,
  • Matola Mozambique,
  • Sentrarand South Africa.

Joule Piston Retarder

  • joule-piston-retarderPiston retarders are used to afford constant speed control throughout a classification yard, and to ensure soft low impact couplings in the classification tracks. (Typical Coupling speed is 1.79 m/s (4.0 mph))
  • The advantage is that all cars will travel at constant speed between switches, within ± 0.5 mph (± 0.22 m/s) from the set speed.
  • Classic clasp retarders employ a system of “catch-and-release” and require very high crest gradients and long entry leads to accommodate the installation of clasp retarders.
  • Piston retarders are easy to install.
  • Piston retarders are easy to maintain. The piston retarders can be maintained without excessive loss to track operating time. Maintenance can be done between trim operations, or in tracks that are not being used, without disrupting the overall flow of the yard.
  • Piston retarder parts are small and can be stored in stock very easily and at low cost.
  • Piston retarders does not require very advanced control software, as is the case with clasp retarders, to control it ’s speed control capabilities. Regular yard switching software is all that is required.
  • The piston retarders are completely self contained and no external software, hydraulic, or electrical control is required for the piston retarder’s operation.


(816) 921 7441

4401 Clary Blvd., Kansas City, MO 64130



(816) 921 7443