An interesting thread, good that you’re seeing any mistakes as learning and still carrying on project managing it. Some good advice and opinions throughout the thread on the build side of things.
I’m a structural technician working on two cycle projects at the moment, one next to the west coast mainline. My initial thoughts reading through were, I hope you’ve checked your house title deeds for building next to the railway and also checked with Network Rail there are no issues being so close. On the rail project, we’re not allowed within 6 metres of Network rails fence line, looks like you’re nearly on it.
Good luck, looking forward to seeing it finished 🙂