I have to agree with the previous post. Mostly self justifying theorising and irrelevant to 60532. I'll challenge only one thing in regard to 60532, which is the rubbish about it "losing its place in the market". IMHO, the longer that 60532 is away from the main line, the greater the impact when it does return. When it comes to 60163 a few realities are conveniently ignored. The changes to the boiler design were forced on the A1SLT by practicality. Copper fireboxes are on their way out due to the difficulty of obtaining the material and so a change is going to have to be made sooner or later. It isn't surprising that there have been problems. 60163 is used fairly intensively but in a sub-optimal way compared to BR days. Back then overhauls came at something like 18-month to 2 year intervals and that would have included major boiler work. And apart from the different design of firebox, what has been done to try to increase the power output? In terms of finance, 60163 is probably the best organised group there is. Look at others such as the 710000 group for example. Their last overhaul was HLF funded and yet there's nothing in the kitty, similar position with 6203. Main line engines of any size are a money pit. Stick to taking photos would be my advice!