The railway is at such an advanced state of decay it would be better to try and salvage 5T and the Ruston rather than waste resources on anything else.
The line requires complete reballasting and resleepering which in materials now would reach conservately a quarter of a million to put halfway right, and that's with 20 plus active and enthusiastic volunteers working hard. Double the cost if you do it commercially.
On top of that the window for acquiring a BNM loco suitable for hauling the carriages(which are in a questionable condition) is rapidly closing.
Giving council disinterest/ineptitude it'll never work out. If it was in England or Wales yeah it's salvagable(indeed it would have never have gotten to that state) but here, nah.