This is a helper set, heading away from the photographer. The caboose makes it obvious, but even without it one could tell based on the orientation of the pantographs. According to the Conrail Electrical Operation Instruction manual (CT-290), "3. Under normal operation of single or coupled electric engines, rear pantograph shall be up on each engine except class E-44, which must have the leading pantograph up. Adjacent pantographs of coupled engines should not be up when it can be avoided." A Bruce Van Sant original Kodachrome slide from my collection.
