maxi-model
UK/US/ROW steam narrow gauge railways 1:1

John you mention a rough plan that you have drawn. I don't see it posted. What Jon has said I have seen on a couple of railways that are a very effective solution to what you are trying to do, if on the ground.
Bit left field here as an "in the air" solution to your bridging issue - a fold up household aluminium ladder ? Not only does it have minimal deflection, with only the weight of the track and train consists on it, but it can be easily packed away when not in use. Just got to figure the track connections if that is permanently fixed to it .
The image shows the hinge, there are 3 on my 11 foot "fold up". These minimise the risk of deflection (sagging) as the ladder is broken up into 4 roughly 3 ft sections with its own bracing effectively built in between each section. Max

Bit left field here as an "in the air" solution to your bridging issue - a fold up household aluminium ladder ? Not only does it have minimal deflection, with only the weight of the track and train consists on it, but it can be easily packed away when not in use. Just got to figure the track connections if that is permanently fixed to it .
The image shows the hinge, there are 3 on my 11 foot "fold up". These minimise the risk of deflection (sagging) as the ladder is broken up into 4 roughly 3 ft sections with its own bracing effectively built in between each section. Max

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