Hey - so sorry, but spotted in file minecart_and_rails.png tile (x,y) 2,7 and 3,7 there's a pixel in each tile at the edge that's transparent, so it doesn't join up the tracks. Think it should be the light tone?
205 days ago(+1)
Hey, that's the file, but it's the part with all the rail corners. I've circled the pixels which are missing, coloured the BG Pink so they stand out. If you join a corner with a straight, there's a missing pixel of track.
I coloured these two pixels in the lightest shade, and the rails looked correct and connected.