From Jeremy, who dreams of assembling a baby robot, called Vaska, they learned about the existence of a “PM engine” - an engine whose energy source is the life-force of the living Sparky.

It's a little unclear with the framing of the sentence.

FThe friends decided to make a magic Sparky to help Jeremy create his Vaska.

Jeremy, having learned something about his opponents; on his way to the train carriage, died under mysterious circumstances most reminiscent of a premeditated murder - on his way to the train carriage.

He was smashed into pieces by a hitstrike from a metal rod that emerged from an unknown electric locomotive passing through the station.

Everybody spent their last night before their eviction on the carriage.

While holding the Sparky close to the axle of one of the sets of wheels, our intrepid adventurers got the old train carriage moving, and traveled for some time to who knows where.

Redundancy

Yurka talked about a conversation that he had had with his mother, from which he concluded that his lostestranged father was a scaderman.

Unless he knew his father who died, list would not be appropriate. And Scaderman? I don't think that's a word in English

They went on, to a railroad fork somewhere in the steppes.

At the entrance to a switch point, Gleb managed to make out some familiar places; it seemed that they managed to find the point where the rail tracks of Earth - -2 and the Earth connected.

Gleb could return to his world, but he decided that there was nothing for him there and instead went down the pathon ahead into the unknown... Yurka left with him.

It's either one period or three. 'Down the path' is very rudimentary, you could use some colloquial metaphor

Turning back before leaving, they discovered that their old wooden train carriage had disappeared, as if it had never been there.

Incomplete phrase

Two friends – Helka Travushkin and Yurka - got acquainted with a violinist named Yanka, a robot named Jeremy and a young journalist named Gleb Vyatkin, who had appeared out nowhere and had settled at the station, in an old wooden train carriage on the side.

From Jeremy, who dreamsed of assembling a baby robot, Vaska, they learned about the existence of a “PM engine” - an engine whose energy source is the life-force of the living Sparky.

Jeremy, having learned something about his opponents, died under mysterious circumstances most reminiscent of a premeditated murder - on his way to the train carriage.

He was smashed into pieces by aafter getting hit fromby a metal rod that emerged from an unknown electric locomotive passing through the station.

Frightened by the death of the robot, the station master demanded that Gleb and his friends immediately goget out of the carriage at once.

Everybody spent the last night before their eviction on the carriage.on the carriage before their expulsion.

Eviction is typically used when it comes to houses.

The night went on for an unnaturusually long time.

Gleb could return to his world, but he decided that there was nothing left for him and instead went down the path ahead into the unknown.. Yurka left with him.

Turning back before leaving, they discovered that their old wooden train carriage had disappeared, as if it had never been there at all.