For more context, the earlier design looks to be the original Balitimore and Ohio "EA" type, he original E-series engine. One remains in a stuffed and mounted

For more context, the earlier design looks to be the original Balitimore and Ohio "EA" type, he original E-series engine. One remains in a stuffed and mounted state at the B&O museum in Baltimore. A similar design was used for the Santa Fe's E1A units. The protruding headlamp design was in the later design E3A, E4A, and E6A types. (The E4 was unique to the Seaboard Air Line, but the E3 and E6 were produced serially for many operators).