I think this song is about somebody who is wanting to go home, but when the person does, they discover their grandfathers death in a very horrible way. After the discovery, they start to think about the sweet memories of their grandfather, and begin to cry. I also find this part to be very disappointing, since they really wanted to go home to a lovely place. I also think this song is about people who are trying to find home, but they can't, so they keep buying tickets to go from place to place to see if they can find out where their actual home is. When they do find out where their home is, they see their grandfather dead on the track. So they go on through their home on trains, remembering the places in sadness. These are just my opinions.