Came up with an idea for technically a locomotive
I'm working on a fictional railway in a fictional country part of the UK. I was thinking of workarounds to streamline passenger operations and thought of Push-Pull trains. The only problem is that this is a tramway in a sense (It qualifies as a tramway, not a light railway). The tramway uses typical stock, like pre-grouping 4 wheel and 6 wheel carriages. I wanted to do something different and thought of something I think is brilliant. Locomotives would have equipment that would send steam through the consist, like heating, though the steam travels beneath the carriages. The engine and consist would have push-pull equipment, though, through sharing steam, the rear coach would act as a second engine.
When steam enters the brake coach, it goes through a small firebox to be reheated and sent through cylinders on the before mentioned coach. This might allow for longer consists and potentially make climbing the tramlines steep gradients easier. The push-pull equipment would make sure both power units would work in unison.
Perhaps steam could be reheated by the engines firebox as well, giving it extra power to travel throughout the system.