The Baikal–Amur Mainline (Russian Байкало-Амурская магистраль (БАМ), Baikalo-Amurskaya magistral, BAM) is a  broad gauge railway line in Russia. Traversing Eastern Siberia and the Russian Far East, the long BAM runs about 610 to 770 km (380 to 480 miles) north of and parallel to the Trans-Siberian railway.