Marshal of the Soviet Union in 1947 by politician Nikolai Bulganin. Two Marshals were executed in postwar purges: Kulik in 1950 and Beria in 1953, following Stalin's death. Thereafter the rank was awarded only to professional soldiers, with the exception of Leonid Brezhnev, who made himself a Marshal in 1976, and Ustinov, who was prominent in the arms industry and was appointed Defence Minister in July 1976. The last Marshal of the Soviet Union was Dmitry Yazov, appointed in 1990, who was imprisoned after the failed coup against Mikhail Gorbachev in 1991. Marshal Sergei Akhromeev committed suicide in 1991 during the fall of the Soviet
Railway electrification in the Soviet Union on electrification investment (to replace diesel traction). By 1990, the electrification was about half 3 kV DC and half 25 kV AC 50 Hz and 70% of rail passenger-km was by electric railways. Compared to the US, the Soviet Union got off to a very slow start in electrification but later greatly surpassed the US. Electrification in the US reached its maximum of 5,000 km in the late 1930s which is just when electrification was getting its start in the USSR. About 20 years after the 1991 demise of the Soviet Union, China became the new world leader in rail