baldwin locomotive works (abbreviated: blw) was an american manufacturing company of railroad locomotives from 1825 to 1951, originally located in philadelphia but moving to eddystone, pennsylvania, for a long time it was the world's largest producer of steam locomotives, after the success of diesel locomotives began in the demand for them, in 1951 it would produce its last of 70,000 locomotives before merging with lima-hamilton to make way for the baldwin-lima-hamilton corporation.