Can I replace all occurences of one loco with another? I know I can make all changes in editor manually, but it should be an easier way I believe.
I use Locoswap for this. https://github.com/flicard/LocoSwap Also very useful in identifying missing rolling stock from scenarios that I've downloaded.
It's also possible to use TSTools to do it, although I'd assume it's a but more complicated than with LocoSwap. I have not used LocoSwap so I can't comment on it.