It’s all good guys. It will be at least 10-15 years before the tree gets a big enough girth. If it does, I will either cut it down or saw a gauge clearance curve into the trunk.
There are lots of possibilities in our garden for expansion.
I think a line into the shed via a securely gated tunnel mouth to provide rolling stock storage (so I don’t have to store the stock after every running session).
I am using a mix of Massoth rail clamps at all R3 points, usat track with the little Allen key bolts and LGB fishplates with LGB conductive grease on all joints. If I get a dry joint at any time I automatically replace with a Massoth rail clamp.