Kevin, T&P 316 has firebox issues which have been dealt with at length in other posts, but basically result from the fact that the new boiler built for the engine was built by a company that built stationary power plant boilers, rather than locomotive boilers. Thus the crownsheet is dangerously steam cut around the staybolts and not safe. Supposedly money was raised to pay for the rebuilding of the firebox by gathering and selling a lot of scrap along the RR and from the Rusk Yard, but apparently that money has vanished into the rabbit hole that is Iowa Pacific's corporate finances, and if you are following what is going on, you will see that there is absolutely now chance of that money ever returning to the TSRR.
If the railroad selects a better operator, from those actively courting it right now, maybe at some point, they will do the work, but each day that the engine sits, more of the 1472 days are gone.
Personally, no engine better typifies what TSRR is and ought to be is the 316, even if #7 and #28 are better suited to the actual day to day operations.