Yeah I felt the same about the Train Graveyard, it was a really cool little self-contained narrative but really bad placed in the overall flow of things, but I guess they were broadly sticking to the order of locations from the original so were a bit constrained there - but even then they could've made it a cool sidequest chain in either Chapter 3 or 8, but then perhaps revisiting the Train Graveyard later on would mean the area had less gravitas, idk.