The Co-op party will be split in two teams. This can be decided by the party members when entering the raid.
Stage 1: All members of party are on roof of the train fighting Enmu(Un fused state).
After defeating Enmu, cutscene appears of him fusing with train and stuff.
Stage2: Will be time based survival
Inside the train: Defend the passengers from dying(probably an achievement for saving all of them) during the time duration.
Outside the train: Dodge and survive all the attacks from tentacles, last 10 second a short opening is created to cut the demon train's head off.
If either of the teams fail, the Raid is lost.
Raid Arena: Train is a 5 coach train.
Inside train : space for one person standing in middle and 2 seats on each side, each coach will have 20 passengers(100 in total across the train)
Roof of train: 5 coach+ 1 engine+ 1 coal carriage.