Declining output from shale-oil fields cut demand for key types of railroad cars, new data shows, the latest sign of the fallout from lower oil prices. Buyers ordered 4,470 new railway tank cars during the quarter ended March 31, down 6% from a year earlier and about 70% from the 14,964 tank cars ordered during the fourth quarter, according to the Railway Supply Institute, a Washington-based trade group. Tank car orders had surged along with output from shale-oil fields, whose crude oil drillers generally transport to refineries by rail. But with a global oil glut that has driven down oil prices by nearly 50% in the past year, output from North Dakota’s Bakken Shale field dropped in both January and February. And the U.S. Energy Department has predicted the Bakken field as well as Eagle Ford, a shale-oil field in South Texas, would report production decreases for April and […]