A yard locomotive tows Milwaukee Road freight train 255 at the east end of the Portage, Wisconsin, yard because 255's crew had used up its service hours--"died on the law." The yard locomotive is in front of the three "covered wagons" (F7 type diesel units on the right). The train on the left is returning from leaving a coal train at Columbia power plant on the M&P (Madison & Portage) branch. Without the photographer's notes, we would not know that this photograph illustrates a common circumstance late 20th century railroading: late trains due to deferred maintenance. Laws prohibit crews from working more than 12 hours, so railroads had to provide yard crews to bring the train in. The other train demonstrates a national phenomonon: vast quantities of coal moving by rail to electrical generating plants.