Amtrak Switcher, 796 Couples to the Power on Train 20

For some reason Amtrak Washington Union Station pup switcher SW1000R, 796 backs in to couple up to the power fresh off Amtrak Train, 20, the northbound Crescent, which consisted of P42DC, 154 and P40, 837. Normally the engineer just takes the power off themselves. The R in SW1000R defined, 796 as a reduced clearance engine for use in electrified settings. Video followed by