Lionel 2046 Engine

I have a Lionel 2046 engine  It has three windows.
It is Heat Stamped on one side and Rubber Stamped on the other side.
Does anyone have any idea what year this engine was manufactured?
Thank you.

Have you tried googling lionel 2046 dating? I was able to find this website in a couple clicks that might date it for you. Looks like 3 different variations. http://www.tandem-associates.com/lionel/lionel_trains_2046_loco.htm