Go into the next compartment on your right when the mission begins to find a 
  phone.
  Drop down into the train car from the roof. The phone is near the ladder.
  Jump across to the freight train, and make your way through the cars. The 
  phone is to the right next to the first ladder you must climb.
  Re-enter the passenger train, and make your way through the cars. The phones 
  is on a crate in the second car.
  After climbing to the roof of the train again and dropping down by a ladder, 
  turn around to find a phone.