The Milan–Bologna railway is the northern part of the traditional main north–south trunk line of the Italian railway network. It closely follows the ancient Roman Road, the Via Aemilia. The line was opened between 1859 and 1861 as a single-line railway, and was doubled between 1866 and 1894. It was electrified at 3,000 volts DC in 1938. High-speed trains on the route have used the parallel Milan–Bologna high-speed line since 13 December 2008.