The BNSF Railway is a class 1 freight railroad that operates in North America; mostly in the United States. It was formed by the merger of the Burlington Northern Railroad and The Atchison Topeka and Santa Fe Railroad. It is the second largest railroad in the United States and owns thousands of pieces of equipment. Some of the road locomotives it owns are GE C44-9Ws, AC4400CWs, B40-8Ws, C40-8Ws, ES44DCs, ES44ACs, ES44C4s, and EMD SD40s, SD70ACes, and SD70MACs to name a few. BNSF also owns many smaller road locomotives and yard switchers.