Where could I find technical drawings of locomotives, with dimensions and things like that. I am thinking of building a BIG model locomotive for my daughter to ride on. I would like to get the exact dimensions of an SD40-2 before I start building it. Thank you in advance!
...Model Railroad magazine's website. I believe they have a searchable index of magazines. They have printed many articles on locos with dimensioned drawings. Find what issue the SD40-2 was printed in and see if you can get a back issue.
If you have or can get a copy of Kalmbachs "Model Railroader Cyclopedia - Volume 2, Diesels" in it you will find drawings of the SD40-2. You will also find drawings of a lot of other diesels.