A few years ago my wife was in an antique shop and came across this pair of pictures mounted in a small ornate wooden frame. She didn't know anything about the subject other than it was train and she liked the frame. I am not sure what she paid but was likely only a few dollars.
Someone more versed in the history of 999 might better determine what year this was taken. It appears it was in the process of being moved, perhaps to Chicago or maybe some other location for display.
Someone had simply used masking tape to join the pictures. I edited them to show the individual pics.
Pete