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Ok,
both of these movies are from my childhood so the details may be sketchy at best.
The first movie i remember was set on a train about some sort of disease/alien that takes over and posseses the passengers. All i really remember is that a priest was involved who got possesed. Also i think at the end of the movie as the train arrives at it's destination the remaining survivors realize that the disease has spread to whatever town they're in and was not confined to just the train.
The second movie was based on a spaceship. The only thing i remember is that there is some sort of monster on the ship (this was probably made in the 70s early 80s) and the monster basically convinces the crew to turn on one another. I think in the end the crew which is a man and woman end up befriending the thing. Something along those lines. I know this probably sounds like every other sci fi movie but figured i'd give it a shot.