I would take jraef's answer as useful and authentic.
Also adding, you will not know the TOTAL weight of the machine until the entire apparatus is actually weighed.
Large motors, and generators are often dismantled on site, and transported in pieces to a repair facility.
What I would do to narrow down your search would be to contact repair facilities whom have
actually worked on equipment of this nature.
Most, (if not ALL) Internet answers to this question are going to be erroneous and not reliable information.
Call/contact repair shops on both coasts of the United States, and pluck a few from the Midwest, and average the answers you’re given… if they are willing to give you a guess at all.
In clicking on this [Historical] question, I was expecting to see a photo of a “metal casting” name plate.
The stamped nameplate reveals the machine is not as old… as [old] is.
John