about cars and trains

Today I went to (visit) my younger sister who is living in Moscow. It's located three hundred kilometers from a place where I am living. I got on a train (which was) called "the Swallow'" and, also, the Russian railway company is calling it a "high-speed train" despite the fact that this train is going with average speed only ninety seven km/h (it's in about 60 mph).
Anyhow, a trip by the train take much more time than a trip by a car, because near Moscow, we commonly run into a huge traffic, in which we may stay till a deep night. By the way this traffic is more than just a "traffic", I'd rather say it's a super traffic, it's an enormous tail of cars, in which we can't make out where is the start and where is the end.
That is why, I hardly ever consider visiting Moscow by a car :)

correct uses in words mostly, but sentences tend to be long; if you want to enhance writing use ";" whenever you can separate sentence into two independent sentences but you want to make one complex sentence structure. Great job though! Sentence structure is a subject that even high schoolers in America who are fluent in English are still learning, great job!