If the other portal is on back of the train, they they will stay at rest(might be displaced to back at lengthOfTheTrain distance
Like that episode of myth busters where they fired a canon backwards out of a moving vehicle
If the other portal is on back of the train, they they will stay at rest(might be displaced to back at lengthOfTheTrain distance
Like that episode of myth busters where they fired a canon backwards out of a moving vehicle