I can confirm that Carnerd3000 is correct. That is the Lake Shore Limited set# 6-1663.
Here are a couple of pictures of the original Box:
FWIW, I added about 16oz of weights inside the #8664 which significantly improved its pulling power.
Here are a matched pair of ALCO's: #8903 (dual motor) and #8904 (dummy) that appear to use the same frame and shell. Not sure when these were made.