Looking at the last photo, the ballast size you're using is a bit on the small side, at least for main line track, which in the US tends to be about 3-5" stone. You may want to try something a little courser, like a fine aquarium gravel in 1/48. Beautiful work on the ties (sleepers), though - those look magnificent! The tie plates are a bit modern, though - they look like ones meant for track clips, which weren't used in the US until (I believe) the 1980's. Even since then, they tend to only be used on high-speed lines or ones with concrete ties. Prior to the 1980's (everywhere), and in most places even now, rails were usually fastened using spikes, which use tie plates that have square holes that allow for two spikes on each side of the rail, and sometimes allow for additional spikes if the plate needs to be fixed to the tie even more securely. Usually only a pair of spikes (one on each side) are used, though.
Here's a photo of what this would look like in use (thanks, Wikkipedia!):
This is not to criticize the work you've done and the effort you've gone to - it's simply to note that the high standard you've set so far for the Pine Grove would be better matched by taking the model of the track to the same level.
Joshua