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3.5 inch Gauge Track

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Bee:
1/4 squ! won't last minutes. Might do for G3 scenic which doesn't have people on it.
You need 20mm x 6mm on edge to give a bit of strength and that then on say a wooden longitudinal on the ground or on angle iron for raised track. The new Exeter MES portable track uses that with ditto sleepers laid on longitudinals made of decking timber (ie treated) split lengthways all in 6ft sections. The joints use scale bolted fishplates which is fiddly.
A friend's raised track, rather heavy 2in angle iron, at the joints has overlapping plates each side that take an M8 bolt - much easier. Then the St Albans portable track uses slightly lighter sections angle iron and a single central bolt.

Bee:
Another common technique is thick sleepers as in 1 inch and slots sawn in them that are carefully judged to grip the steel rail but not split the wood.

Bee:
Note stand is welded to track which makes it rigid but heavy

Bee:
and extensive packing is required even when they tell you the site is flat as a bowling green.

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