Sonic explained what happened to him during their Murder Mystery game to his friends, revealing that the train had actually belonged to Eggman. Everything suddenly goes dark and the train shakes, separating everyone.

Once the train's lights had come back on, everything was red, doors were locked and Sonic had fallen into the lounge. "Ugh...my head..." He rubbed the top of his head with a pained groan, having seemingly bumped into the wall while it was dark.