>>1305113I'll go into this more, but it really depends on how much of the work you want to do yourself versus hire people to do it for you. You could absolutely get away without using plates on a light weight narrow gauge setup, so that's going to save you a bit off the bat, but let's look at some prices...
You're going to have a difficult time pricing out ties without actually contacting somebody, but we'll go with $10 a tie. In mainline construction you're usually using ~2700 ties per mile. But you might be able to get away with about 2,000 in your case with increased spacing. So that's 20,000, but you'll probably need more because you're going to want to add some sidings, other tracks, and have some spare ones for repairs. So let's add another miles worth just to be safe. So $220,000 on ties.
Now for spikes. We'll go the cheap way and say you need 3 spikes per rail per tie, so 6 spikes per tie. You really want more than that for switches, and 4 spikes is the standard for tangent track, but we'll go cheap. 6.5" spikes are right at $1/spike. You can use smaller ones that are about a third less in cost, but 6.5" really is the standard these days. 6 spikes x 22,000 ties x $1 = $132,000 on spikes.
Now the ballast is something that's just going to vary widely based on your supplier, so I can't even get you close. Let's just say $200,000 on that and call it a day.
Now for rail lets get some 75-80 lb. stuff. Really the lighter the better for your case since it's cheap. I found this
http://www.sterlingrail.com/classifieds/classified.php?id=18061Based on my retarded dimensional/price analysis that is $4.25 per foot of rail and you end up spending just under $500,000 on 11 miles worth of the stuff. (Remember you really need 22 miles of the stuff for 11 miles of track!)
So far we're at just over $1 million on the raw materials. To be continued...
