It could be seen as focusing on propulsion - it ought to be this is the Steam Traction section - and it is looking at speed. The question is about what might have been possible during a certain period looking at a specific application. Could a steam locomotive be designed during this period which would deliver the power output of a class 50? The answer is yes. Could a locomotive be designed which would offer a continuous power output which matched it? Again the answer is yes. If it could be done, could it have been done here? I would say it would be most unlikely. The best locomotive engineers were not here in the UK, they were elsewhere. The question of developing rolling stock to offer different facilities for passengers is for those who work in this field. Meeting the power requirements would involve consultation and development. When the question was asked, Westinghouse maintained that was no problem in fitting improved, more modern braking systems to steam locomotives. Single-manning, the N & W had worked on this and it was possible. Multiple unit working would also have been possible. Raise the issue concerning an identified requirement and obtain answers and solutions. If you don't adequately raise the question you don't get answers and you can get the answers you want by not asking.