Hi Charlie,
I hope to start construction on my Railway at the Farm House this summer.
If you want a track that is working height off the ground and you use in the States 4" or 6" diameter agricultural fence posts that are sharpened at one end to be driven into the ground. A friend of mine came up with simple to make and level track support system which is a very good idea in my opinion. If you are interested I can ask him for some construction photographs of the track he built.
Take care stay safe.
Tony.