 They are pulled on one end by one of SEPTA's work diesels (or a diesel borrowed from a local shortline such as the West Chester Railroad), and controlled at the other end by a former LIRR "Power Pack" cab unit (one a former ALCO FA, the other a former EMD F7).However, as of 2015; The FA and F7 were retired and replaced by Comet 1 cab cars.In the United Kingdom, a number of rail companies change their timings and publish special "leaf fall timetables".