The Trans-Siberian Railroad City is Omsk, a city located in southwestern Siberia, Russia. It is the administrative center of Omsk Oblast and is situated on the banks of the Irtysh River. Omsk is the second largest city in Siberia after Novosibirsk and is an important industrial, cultural, and educational center in the region. It is also a major transportation hub, with the Trans-Siberian Railway passing through it.