Transsiberian is a 2008 film thriller directed by Brad Anderson and starring Ben Kingsley and Woody Harrelson. The Younger Son and I found this fascinating. It kept up a good sense of dread but wasn't so intense I couldn't enjoy watching it.
EW gives it a B- and thinks it needs "more spice". Slant Magazine says, "Overall: Kind of like a roller coaster ride on a Transsiberian cross-country train without any of the amenities." Roger Ebert says it's " one hell of a thriller." Rotten Tomatoes gives it 91%.