Kato 176-CHICAGO N Scale Chicago Metra EMD F40PH #104 DC
To support passenger service, the F40PH is equipped with a secondary electrical generator referred to as the head end generator (or HEP, for Head End Power). New Commuter-version F40PH locomotives and Amtrak Phase III ditch light versions have retooled bodies with over-cab A/C units and illuminated ditch lights.