Here's some of the stuff I take on any trip in an Amtrak sleeper:
• Medium sized plastic bag to block a heating/cooling vent that won't respond to the room thermostat
• 2-3 feet of duct/gaffer's tape to hold the bag over the vent
• 3 or 4 carpenter's wooden wedges/'shims to jam in and silence rattles
• Package of hand sanitizing/cleaning wipes for the usual stuff plus to clean windows for clearer pictures
• Earplugs in case there's noisy people around
• Rubber flip-flops if you plan on taking showers
• Route Guides for each of the routes in case they're not provided
• Notes for each leg of the trip about any interesting features along the way (so you won't miss them) gleaned from:
•• Google Earth
•• Topographic maps from...
http://www.mytopo.com/maps/index.cfm?feature
•• The FRA map...
https://fragis.fra.dot.gov/GISFRASafety/
• Small 2-3 oz squirt bottle of pure maple syrup (optional)
• If you use a stand-alone camera, a rubber lens shade to block inside the train reflections when the lens shade is held loosely against the window.