Hello folks. i am trying to reaserch a loco built in the USA by Alco (i think but it might have been baldwin?) around 1927 (again - i think!!) for export to China. i believe they made 7 of them but again i am not sure.

What i am really after is a set of drawings. does anyone know if the drawings from Alco still exist anywhere? I dont really do US railroads so i have no idea where to even start with this.
Any help would be greatly apreciated.
Peter