The testing laboratory Cetest has successfully completed the stationary tests to extend to 125 mph the homologation of Sleeper Viewliner I vehicles for Amtrak, the passenger intercity rollingstock network of the United States. Parts of the tests have been performed in Amtrak’s facilities in Wilmington (Delaware), with specific portable test rigs designed by Cetest During these tests, the wheel unloading is measured, a key parameter in the safety against derailment, as well as the rolling coefficient, which is used for the gauge calculations. In this first phase, Cetest has also carried out vehicle modal analysis tests. Next June, Cetestwill complete the test campaign with on track tests for the evaluation of the dynamic behavior, which will enable them to obtain the authorization to increase the circulation speed from 110 to 125mph, in conformity with the requirements established by America authority FRA (Federal Regulation Authority). Thanks to this new project, Cetestreinforces its presence in the US, as well as the technical recognition of the most important players in this country.