Non-Standard Applications of the IRS 40421 Methodology

This paper shows three non-standard applications of the "relative approach" envisaged by the International Railway Solution IRS 40421: this document imposes some restrictions on the mass and length of interoperable freight trains, but it also provides a methodology for admitting to the traffic trains that exceed these limits.The paper considers the case of a single train, a family of trains with a new brake position and an optimized wagon order.