Sentimental Lyrics

Lyric discussion by XCrusherX 

Cover art for Sentimental lyrics by Porcupine Tree

Yes, the "Trains riff" is a link to the next song, "Way out of here". As you know the song starts with: "Out at the train tracks I dream of escape" So in this moment our protagonist is in the house of his cousin, experiencing everything from "Trains", and after that he's leaving again in "Way Out Of Here".