How can i get relief from constipation on long train ride?

Bowel training: Create a schedule for trying to have a bowel movement. Take advantage of the "gastrocolic reflex" by sitting on the toilet 20-30 min. After a meal even if you don't feel the urge to go. Load up on laxative foods-fruits, veggies, juices, and water. Remember, if you eat a lot of fiber, you need to drink more fluids. Consult with your doc/or a GI specialist if you need other options-meds.

Walk and drink water: The body often responds to less activity than usual with change in bowel habits, often constipation. When traveling, head this off by frequent walks (harder on planes, but easy on a train). Drink lots of water. Avoid constipating foods- buy or bring healthy snacks that are easily portable, like grapes and carrots.