Athearn RTR Southern Pacific SD40T-2 A history of how it came to be and a model railroad review

Athearns Southern Pacific tunnel motor is a sight to be seen and is a solid locomotive. I go through the history and how we came to tunnel motors in general
Sources
a title="Joseph Zadeh, CC BY-SA 4.0 <creativecommon..., via Wikimedia Commons"
href="commons.wikime..."img width="512" alt="SD40-2 vs SD40T-2"
src="upload.wikimed..."/a
Marty Bernard from U.S.A., Public domain, via Wikimedia Commons
terry cantrell, CC BY-SA 2.0 creativecommon..., via Wikimedia Commons