I only spent a few days in Moscow, but in that time I still managed to find a number of Moscow Metro trains wearing commemorative liveries.
The first was the “Red Arrow – 75 years” train, which features a special red and yellow livery.
Launched in October 2006 in honour of the 75th anniversary of the Moscow-St Petersburg “Red Arrow” train, the set was damaged in the 2010 Moscow Metro bombings, but re-entered service on 15 May 2010.
I also came across the «Народный ополченец» (People’s Militia) train.
Launched in November 2006, the train features the standard blue and write livery seen on the rest of the type 81-717.5 / 714.5 train fleet, but with special stickers on the side, commemorating the ‘Great Patriotic War’ of 1941-1945.
And the final train I found was Ретропоезд «Сокольники» (retrotrain “Sokolniki”).
Unveiled in 2010 to mark the 75th anniversary of the Moscow Metro, the train was specially built by manufacturer Metrowagonmash as a replica of the trains that operated in Moscow back in the 1930s.
The exterior is painted in brown and tan.
A yellow interior.
Reproduction wallpaper inside the saloon.
Old fashioned sprung seats.
And the State Emblem of the Soviet Union on the side.
Footnote
A complete list of Named trains of the Moscow Metro can be found on the Russian language Wikipedia – a total of 11 trains are currently in service, along with 12 retired themes.