If you choose the Russian railway, make sure your train will travel along the 145 km long Black Sea coast during the day, preferably in the morning. It is then that you will almost certainly spot dolphins swimming in the sea, whilst you have breakfast in your carriage. This is an amazing sight, as we can say from experience.
At least ten trains per day travel from Moscow to Sochi. The trains leave from different train stations so check carefully at www.rzd.ru. The fastest train – which is also the most expensive and luxurious – brings you to Sochi in less than 24 hours. Other trains will take up to 40 hours. From St. Petersburg there are two direct trains to Sochi during summer, and one in winter. The journey from St. Petersburg takes between 35 and 48 hours.