@Jessabeans , unfortunately the train tracks have been disappearing in some test lots when Rox places the train car. It may be because the tracks are sitting too high. She's been trying to hide the lip of the tracks with the loading platform, however if you're going to sink the tracks that may totally or partially fix the problem.
It would be better we wait for your next update since the height of the lip off the ground makes a difference on how high the loading platform needs to be. We prefer your original tracks and are currently using a 24x14 for the train car lot. For the next update could you add a station with the station lot and a few 24x14 and 24x15 car lots for comparison and final testing please.