Looking carefully at photo GB-6133 of Bridge 224A it appears as if the new mainline is built almost directly on top of where the original water tank was located. I don't see any remnants of the stone foundation. It also looks like the bridge 224A being bypassed is actually a replacement for the one in the original photo I posted. The original had square ends and the one being bypassed has curved ends. Looking carefully at the right edge of the photo it looks like there might be tie impressions in front of the fence curving away to the right. Neat area, too bad it's so hard to get to...