The Spring 2015 Issue of the TRB publication, Intercity Passenger Rail Systems Update, includes an article co-authored by LTK’s Josh Callen entitled “PTC Progress in California.” The article covers work at Caltrain to install and test their new PTC system. Caltrain will be the first passenger railroad in the US to use Interoperable Incremental Train Control System (I-ITCS). By using incremental train control (ITC) this system will be interoperable with other railroads using the corridor whose PTC systems use Interoperable Electronic train Management System (I-ETMS).