What is "elektrichka"

Elektrichka (; ) is a Soviet and Eastern bloc commuter (regional) mostly suburban electrical multiple unit passenger train. Elektrichkas are widespread in Russia, Ukraine and other countries of the former Warsaw Pact presenting a socially vital mode of transportation. In 2007, 4085 commuter trains a day (in each direction) were running on the Russian Railways network alone, most of them electric. The first elektrichka ran on July 6, 1926 along the Baku– Sabunchi line in Soviet Azerbaijan. Also urban (intra-city) gorodskaya elektrichkas and airport's aeroexpresses exist in a few cities of Russia, Ukraine, and Belarus.