I found this in my girlfriend's house in Finland. They said they think their grandfather got it off a Russian train in the 1930s as far as I understand. Could anyone give me more information about it because they didn't seem to have much and I'm interested. Thanks! I included pictures of the hilt markings and the whole sword. It's about 45+cm long maybe.
Those letters appear to be an abbreviation for Собственный Его Императорского Величества железнодорожный полк, or His Imperial Majesty's Own Railroad Regiment. The unit existed under that name from 1915 to the revolution. I haven't found any pictures of anyone in this unit with a sword, though.
Here's an English translation of a portion of the French ambassador's journal mentioning the unit:
"In addition to these cavalry and infantry contingents General Voyeikov has at his disposal a special unit, His Majesty's Railway Regiment, comprising two battalions with a total strength of 1,000 men. This regiment is commanded by General Label and is in charge of the management of the imperial trains and responsible for the inspection of the permanent way when Their Majesties are travelling. This work is of the highest importance as to "blow up the Tsar's train" is one of the ideas that obsess Russian anarchists. Not so long ago one of them succeeded in concealing himself by clinging to the undercarriage of one of the coaches with a bomb in his pocket."
You could also give /r/whatisthisthing a try.
/r/swords is a great place to put it. They'll be able to tell you at the very least what type of sword it is and if it may be interesting (though their word isn't final in that respect.)
I can't tell you about that sword in particular, but the pattern appears to be based on (or originally?) the Model 1831 French artillery short sword, which was a popular design and copied by many manufacturers. Large numbers were made and the original is still a fairly common find.
A quick Google around suggests Russia copied the design as the "Pattern 1848", which is presumably what you have there, but I haven't found a citation (that isn't just unsourced repetition of the same statement) or any actual pictures of one.