Trans-Siberian Railway one side of the lake to the other until the completion of the Lake Baikal spur along the southern edge of the lake. With the Amur River Line north of the Chinese border being completed in 1916, there was a continuous railway from Petrograd to Vladivostok that remains to this day the world's longest railway line. Electrification of the line, begun in 1929 and completed in 2002, allowed a doubling of train weights to 6,000 tonnes. There were expectations upon electrification that it would increase rail traffic on the line by 40 percent. The additional Chinese Eastern Railway was constructed
Return of the Chinese Eastern Railway China National Railways, the Soviet Union was able to maintain trade access to China at lower cost. Furthermore, the CCR was significantly underdeveloped compared to the remainder of the Soviet Trans-Siberian Railway (which was being rapidly modernized after World War II). All of these factors combined to make returning the railway to China a cheaper bargain than upgrading and integrating the CCR into the Soviet Railway system. Ultimately the strategic loss of the CCR was more than made up for by the strategic benefits of the new Sino-Soviet Alliance. These benefits were seen both immediately with the Korean War but