The level crossing is located in an area of dense woodland, which always succeeds in reducing the amount of daylight reaching the ground, meaning that it always seems quite dark and mysterious. It's on a fairly minor road, with no houses or buildings nearby except for the small house adjacent to the LC, and thanks to the dense trees it usually seems very still and quiet in that area, the noise of the main road nearby is completely blocked out. So with the impression of the LC being located on a little rural lane without another soul in sight could very well give it the impression of being "sinister". I think it depends on how many stereotypical horror films you've watched

Personally, I've walked in the woods around Naworth and I don't find it any different from any other woodland anywhere else, I've never been troubled by ghouls and ghosties in the area!