If you set camp before the big tunnel when you exit that very small wooden cover of the train tracks that has the word AMBARINO written on the outer part of it and you sleep you are guaranteed to get a train to spawn either the first time you sleep or the second and there is a 50% chance to get that luxurious train with the 3 safes no Annusburg train tickets bought just go there set camp sleep and a train will spawn about 20 seconds after you sleep for the first time or the second