So, "Tale of the brave". Sloped boilered engine. Culdee, anyone? It doesn't seem like coincidence that Andrew Brenner is now head-writer, the CFR was mentioned in BMM and that the engine mentioned has a "sloped boiler". It seems likely that the Culdee Fell Railway will now be introduced into the TVS! I couldn't find any standard-gauge sloped boilered engines and I can't really think of any other explanation as to why a sloped-boilered engine would come to Sodor. What would happen if it was introduced, though?
I think that if it was introduced that Culdee's smokebox would be coloured black. Just something I thought seemed likely. Also, I think that the other engines (e.g. Eric, Patrick etc.) would be painted different colours. Why? Just think about the Skarloey Railway. When they were introduced in season 4 the engines had different colours to differentiate eachother, as some of them would look similar to kids watching (e.g. Sir Handel/Skarloey/Peter Sam, Rheneas/Duncan). The Culdee Fell would be even harder to differentiate as their designs are only of 2 types, shared between 8 engines.
That said, however, although Culdee and Lord Harry would be most likely to be introduced, some of the others may not as they were only very minor characters, the only engines having stories centering around themselves being Godred, Lord Harry and Culdee. That said, however, some dialogue would need the other engines to work and the engines also have had personalities given to them via magazine stories and annuals/other books. I have also compiled a list of what colours I think they would be in below:
1. Godred - Red
2. Ernest - Light Blue
3. Wilfred - Yellow
4. Culdee - Purple
5. Shane - Green
6. Patrick - Purple
7. Alaric - Dark Blue
8. Eric - Orange
In conclusion, as stated above, I think that the Culdee Fell is likely to appear in "Tale of the brave". The Culdee Fell engines seem likely to appear in the above colours and I hope to see them soon.