Although almost all of the Class I railroads have been deploying precision scheduled railroading (PSR), an operational model that seeks to streamline operations, for several years already, a number of issues keep the debate over its value alive.
The railroads have argued that PSR provides shippers with consistent and reliable service. Proponents of PSR contend that shippers previously had to wait until a train was long enough in order for them to receive service, making service more erratic....
https://www.freightwaves.com/news/the-perils-of-precision-scheduled-railroading