Har erhållit nedanstående på mail från Dennis Brauer Iversen.

"Thanks for posting "Kejsarinnans vagnar över isen till Finland", it is really interesting.
http://www.jvmv2.se/forum/index.php?mode=thread&id=204868

Some of the comments you received are a bit weird:

The suggestion that the imperial carriages might have been Danish is rather absurd; DSB has never had cars that were convertible to 1520mm broad gauge. "Fortegnelse over Driftsmateriellet" (1919) lists nine "Salonvogne" numbered consecutively 1–9. Those that were intended for travel abroad had "Tyske Slutsignalholdere" and "Trykluftbremse" (Denmark used vacuum brakes), but all had 1435mm gauge. You can fit 1435mm axes on 1520mm cars, but not the other way around.

Salonvogn S8 was the royal car (with a big royal coat-of-arms in the middle of the car, two living/office rooms and two T1s with sliding door), S9 was for the retinue (one living room and three T2s). They had steam heating, electric lights, one common WC and one common bathroom. They look entirely different from the Russian car in the link below, which had an electric lamps over each entrance door, 9 chimneys over the 9 compartments (chimneys for ovens? or perhaps for petroleum lamps, but the car obviously had electricity?), 2 exhausts from toilets/bathrooms and 1 longer tube (perhaps the chimey of a samovar?), plus small golden (chased ormolu) coats-of-arms between each pair of windows:
https://4.bp.blogspot.com/-QWXPwNFNm8Y/WD53xZ5JwMI/AAAAAAAAL8Y/EzIhylGelPAuGblc50ChZ5Jv...

The photo "Änkekejsarinnan Dagmars tåg dras i början av 1917 över Torneälvens is från Haparanda till Tornio" shows the same coats-of-arms between the windows and the characteristic electric lamp over the door, but apparently fewer (or lower) chimneys. The undercarriage and wheels are rather spectacular, it could well be broad-gauge bogies fitted with normal-gauge wheels.

In Peter Elfeldt's film from 1904 "Kejserinde Dagmars Ankomst til Gentofte",
http://filmcentralen.dk/museum/danmark-paa-film/film/kejserinde-dagmars-ankomst-til-gen...
the Dowager Empress travels in a narrow saloon car (~2600mm wide, with an outside step for the conductor). It is much narrower than the Russian cars (~3000mm wide). Judging from the windows, it might be S3 or S7, or perhaps S5 before it was converted to a funeral car in 1905 (ex Rb 391 in "Illustreret Fortegnelse over Driftsmateriellet", 1890). In front of it is a bogie car (for the retinue?) with no lamp over the door and no coats-of-arms; it has pairs of narrow double windows divided this way:
door | 2 2 | 2 2 | 2 2 1 | door
This doesn't match any of the Danish S-cars (ex R-cars). It might be a I/II class car litra AN from 1897–98. (DSB had three classes, I/II/III.) All in all, this is a Danish train.

One commenter wonders why Dowager Empress Maria Feodorovna (née Dagmar) travelled by train when visiting Denmark in 1914? Well, perhaps she visited relatives en route, — she had many, e.g., in Bad Homburg/Berlin, Darmstadt, Glücksburg, Gotha, Karlsruhe, Kassel, Lippe, Oldenburg, Schwarzau am Steinfeld (south of Vienna, seat of the disposed House of Bourbon-Parma), Schwerin, — or perhaps the imperial family travelled by train for the same reason that Donald Trump travels in Air Force One: Because he has it; he uses it to impress people. The Russian imperial train was just as much intended to be representative and impressive; where else do you find a train with a bathtub(!) plated with silver?
https://rarehistoricalphotos.com/romanov-imperial-train-1890s/

Another of your commenters confuses the calendars, drawing the wrong conclusion: "när tåget rullade över isen var familjen Romanov redan under isen". Russia used Old Style (until 1918), Sweden and Finland New Style (since 1753). In 1900, the difference had grown to 13 days: The Russian February Revolution took place in March. Here the chronology:

According to the letters you published, the Finnish Railways requested the imperial train to be transferred on 8.12.1916 (25.XI Old Style). Behind this must have been a Russian request; until 6.12.1917 (23.XI) Finland was am autonomous Grand Duchy within the Russian Empire.

The question is, why did Russia ask for the return of the train at exactly this time and not one or two years earlier, or perhaps not at all? Tsar Nicholai II was at the front, his unpopular German wife, Tsarina Alexandra, ruled on his behalf from Tsarskoye Selo. Nicholai had his own imperial train, the three cars that later were given to Peterhof museum and were destroyed during World War II, as described on rarehistoricalphotos.com.

Why did they need the additional cars that were stranded in Denmark? Pure speculation: Perhaps they wished to be able to be able to evacuate the imperial family, notably the Tsarina and Tsesarevich Alexei who suffered from hemophilia, making travelling inherently life-threatening."