I think Andy was actually alive in the last panel and that it wasn’t just Bran hallucinating. If Andy, while lying on the railway tracks, was able to partially sit up and watch Bran having a seizure then he could just as easily have rolled off the tracks, gotten up and disappeared while the train was passing. That would also explain why there wasn’t any blood on the tracks afterward. Because of that I’m convinced it was Andy who came back and injected Bran at the end. It makes the ending even more disturbing because it suggests Bran can never escape Andy. And the final panel really gave me the feeling that the torture is going to start all over again.
(( SPOILERS ))
I think Andy was actually alive in the last panel and that it wasn’t just Bran hallucinating. If Andy, while lying on the railway tracks, was able to partially sit up and watch Bran having a seizure then he could just as easily have rolled off the tracks, gotten up and disappeared while the train was passing. That would also explain why there wasn’t any blood on the tracks afterward. Because of that I’m convinced it was Andy who came back and injected Bran at the end. It makes the ending even more disturbing because it suggests Bran can never escape Andy. And the final panel really gave me the feeling that the torture is going to start all over again.