Sentence 1: Dale and Becky took a passenger train across the country. 
 Sentence 3: The swaying of the dining car made Becky feel sick to her stomach 
 Sentence 4:  She went back to her seat in the passenger car 
 Sentence 5:  After she ate a few crackers, Becky felt better 
 Option 1: They went to a diner at a train station stop for their first meal. 
 Option 2: They went to the dining car for their first meal.