Answer:Omsk \quad (or alternatively Novosibirsk)
Explanation:
Omsk is a major agricultural center along the Trans-Siberian Railway. It is located in the fertile steppe region of Western Siberia and is known for:
Processing of agricultural products (grain, dairy, meat)
Agricultural machinery manufacturing
Being a major collection and distribution point for agricultural produce from the surrounding black earth region
Novosibirsk is also a major agro-industrial center, but Omsk is particularly significant for agriculture.