Now that the welsh Highland has been linked up with the Ffestioniog, perhaps now we can think about an epic narrow gauge gala to celebrate this 40 mile railway of wonders.
The welsh highland has a very large loading gauge, so could it be possible for one of the vale of rheidol tanks to visit, and work this section, and possibly work with it's southern counterpart, Lyd?
Other visiting locos that I suggest are:
A Brecon Mountain Baldwin 4-6-2
A quarry class tank from Llanberis
Stanhope
a Baldwin class 10-2-D
Russel (when overhaul is finished )
It's just a thought, but when the current improvement plans are fulfilled, I don't see why this cannot be possible, unless coupling is a serious issue. We could also have an NG15 in a few years.