1) I see no NewGRF posted. Were you going to update this later?
I did not post the grf here because I thought uploading it to 1 place (BaNaNaS) would make it easier and cleaner if I make updates in the future. But if this is the right way to go I'll upload it to the first post.
2) Are you also aware of the Universal Rail Type NewGRF?
Yes I am, but this functions fundamentally different. Universal Rail Type introduces as the name said: a totally new rail type wich has to be attached to your network. This modification grf totally eliminates the need for an intermediate rail type or engine. It was made with long MP games in mind. The idea is that using this grf converting from ELRL to MONO will be just as simple as converting from RAIL to ELRL. This way you can spend your time expanding your network or watching your trains, in stead of having to convert all trains manually or build special conversion sidings.