Who knew? Not me... Alco built an S13? Well that's what it is called everywhere on the Internet.
Formerly CN 8711 it kept it's road number and now works warehouses switching refrigerator cars off the BNSF and UP in Rochelle.
Thanks to Robert
I now know the S13 was one of several end-cab switchers that MLW produced, but parent company ALCo never did. The S13 was a 1000 hp, 251-engined version of MLW's S11. Both were built on ALCo S6 frames.