It appears the conductor just threw the cat in the snow even though contrary to this article it had a ticket and was returning with the owners grand parents after an operation. Eye witnesses on the train say the conductor was fully aware of the cats ticketed status but threw it out anyway.
Russia: Cat thrown off train into snow found dead - BBC News
Russia's state rail company apologises after its conductor dumped the feline in freezing temperatures.
www.bbc.co.uk