Transsiberian (2008)

Americans abroad. Roy and Jessie finished a volunteer stint in China. He loves trains, so they go home via the Trans-Siberia Express. There are strains in the relationship, including her past. They meet Carlos, a Spaniard, traveling with Abby, a young American. Carlos keeps close to Jessie, and when Roy is left behind and waits a day for the next train so he can catch up, Jessie and Carlos take a trip into the dead of winter to photograph a ruined church. Carlos may be running drugs, so, later, when Roy catches up and introduces Jessie to his new pal, an English speaking Russian narcotics detective, he's the last person Jessie wants to see. Will the Siberian desolation be their undoing?
After a period of volunteer work with needy children in China promoted by his church, Roy and his wife Jessie decide to travel to Russia by train on the Trans Siberian Railway. Roy is a naive American with a great passion for locomotives and Jessie, an aspirant photographer, is haunted by her past image as a "bad girl". During the journey, they share their cabin with a Spaniard, Carlos, and his American girlfriend, Abby. At one station Roy get's off the train to look around other trains in the yard but is left behind; Jessie decides to wait for him at the next stop, and Carlos and Abby stay with her. While waiting for Roy, Carlos invites Jessie to travel to the countryside with him where they see a ruined church in the middle of nowhere. Carlos tries to force Jessie to have sex with him, and Jessie kills him with a plank. Jessie does not report the crime and meets with Roy on the next train. Roy introduces Grinko, a narcotic division detective, who is sharing the cabin with him. Jessie finds out that Carlos was trafficking drugs and scared, she tells many lies to them. However the experienced Grinko does not buy her story.