Can you put a E-unit into a Marx 490 that wasn't originally made with one? TLDiff

This was and still is the poor boys train. The non-smoking 490 goes pretty good for the age. It's been cleaned and serviced. The four wheeled rolling stock are a mixture of a Santa Fe Boxcar (Yellow) a blue gondola, a grey crane and a scarce NYC white caboose. I have a simple oval layout. On a...