Thank you all for your opinions. The shed you see in my pic would be no part of the railway as when I open the door the contents thereof fall out on me! I have considered putting an 8 x 6 shed in the other corner, aligned t`other way, for covered running. When I saw my landlord at lease renewing time she said she would be happy if I stayed here `forever` so I`m not worried about imminent eviction at any rate.