Yeah the train has a save and a heal near the start.I found one heal cop near the end of the sewer so i was able to skip all the fights and then backtrack and kill all the monsters and keep back tracking to heal and save.I still need more potions yet.
This is my 2nd time through as i wasnt getting anywhere with the first attempt kept running out of potions.This time i have taken my time and each time my energy has gone low ive used the heal cops thus saving the potions.