We feature a tremendous variety of O Gauge Diesel Locomotives on our online Store. Our O Scale Diesel Locomotives are provided by major model railroad brands Bachmann, Lionel, and MTH. If you are looking for a First Generation cab unit, our selection of numerous road names includes EMD F7s and other models in individual units, A-A Sets, and B Units as well. First Generation Road Switchers are represented by a fine selection of EMD GP9s, one of the most famous models ever. Add Second Generation EMD Geeps such as the SD45 and Third Generation GE Dash 9s plus the GE Genesis passenger locomotive and you can see we will have the O Gauge Locomotive you are searching for. Browse our huge selection today!