Ключевые слова: cargo, cargo train, carrying, caucasus, critical, crucial, crude, diesel, electric, endless, essential, flammable, fuel, gas, gasoline, huge, important, infrastructure, key, long, lower, lower volga, many, natural, natural resources, oil, oil fields, oil rich, petrol, petroleum, rail, railroad, railway, region, reserves, resources, russia, russian, rzd, stalingrad, strategic, supply, tank, tank car, tankers, train, transport, transportation, volga, volgograd,