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Joe, That box on the Engineer's side running board contains equipment (a motor-generator set, or "MG") for the Cab Signal/Train Control used in several places on Conrail. Originally this Cab Signal system was installed by the Pennsylvania (PRR) on their principal main lines, but Conrail installed some sections of it on other lines to facilitate new traffic patterns. Most Conrail locomotives were equipped with Cab Signal equipment to enable their unrestricted operation system-wide. However, as locomotive and signaling technology advanced through the years, it was not necessary to have a MG set to provide the proper voltage for the Cab Signal equipment, so the abscence of the box on the running board does NOT necessarily mean the unit is not cab signal equipped.... Hope this helps. You Pennsy fans who are more up on this than I am, feel free to expound/correct as necessary! Harold
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