Passenger locomotives

[Green_Elite_Cab]

Frank...That's a fine looking engine not often seen...

What was the logic behind that configuration..?? How was coal fed to the firebox..??

I've wondered this myself. I'm guessing that a crew member must have hung out in the back (there appears to be a small sheltered area on the back of the engine before the tender), and the engineer stayed up front. I wonder if the camel-back was designed that way to increase visibility?