context: Apart from the Nizhny Tagil Cherepanov industrial railway, the first railway in the Russian Empire was built in 1837 along the route "St. Petersburg - Tsarskoye Selo" (12 years later than the first railway in the world that appeared in the UK in 1825). The millionaire A. A. Bobrinsky financed the construction, and was led by his Austrian engineer Gerstner. In the 1840s, a much longer Nikolaev railway was built, connecting the two largest cities of the empire - St. Petersburg and Moscow.
question: When was the Russian railway built?
answers.text: 1837