Images from amateur Russian trainspotting websites appear to show Putin's train.
The train is painted to look like an ordinary Russian Railways train.
Among the parts of the train detailed is car number 021-78630, with a gym and spa for Putin, according to the Dossier Center.
The Dossier Center is backed by Mikhail Khodorkovsky, an exiled former Russian oil tycoon turned Kremlin critic.
A glossy brochure made by Zircon itself shows a luxurious gym and spa on wheels designed for Putin, the Dossier Center says.
Persons:
Vladimir Putin’s, ”, “, Putin, Yevgeny Prigozhin’s, Mikhail Khodorkovsky, Zircon
Organizations:
Russian Railways, CNN, Transportation Administration, Kremlin, Süddeutsche Zeitung, NDR, WDR, Service
Locations:
Russian, Ukraine, Mykolaiv, Moscow, London