An EMD SD30?
Railroad Model Craftsman 1972-09 pg. 29 Scale: (none) Category: "Locomotives - Diesel"
EMD produced matching SD units to their GP units, but they never did an SD30 (nor a SD20). The scale drawing shows what an SD30 might have looked like.
The ALCO RS1: Granddaddy of the Road Switchers
Railroad Model Craftsman 1991-05 pg. 60 Scale: Category: "Locomotives - Diesel"
This article covers the history of this fantastic engine. Color and black&white photos of RS1s from many railroads are included, as well as scale drawings.