The term STOP ON THE TRANS-SIBERIAN RAILWAY can be summarized as a reference to the city of Omsk, which is located in southwestern Siberia and is one of the largest cities in Russia. It is a major stop on the Trans-Siberian Railway, the longest railway line in the world, stretching from Moscow to Vladivostok. Omsk is an important industrial and cultural center, and is home to many universities and museums.