I'm a bit worried about the width of the steam engine model you're working currently. I'm not a bit expert in this field but IIRC there was a requirement for engines and wagons to be half-tile in size. In case I'm right on this wouldn't the model you're working on be a bit too long for glitch-free use? I hope I'm wrong on this but if not - it's a thing that should be cared about rather sooner than later.
P.S. I think Xotic750 might give a good advice on this.
Yes, it's too long, but I don't care
. It might cause some graphical glitches, but I've tried long locomotives in-game before and I thought it worked pretty well.
1) It will always be attached to a tender, which will be shorter than a half tile.
2) I might put restrictions to stop the player from using double engines (after all, that was rather uncommon back in those days).
3) A small amount of overlapping can be tolerable
Also, I'm waiting for someone to remove this silly restriction
. I've seen long road vehicles in the past, so I can't see why it shouldn't be possible to do with trains. I'm also planning to use extra angles, which eddi already has proves it possible, so I think think that would work really well with longer vehicles.
But this project will contain glitches, no question about it. You will eventually see piles of rocks disappear under houses and stuff like that. Certain parts of a locomotive might disappear when entering a tunnel. That's why I call this an "unoffical project". I want to explore the possibilities, even though some might think that it hurts the gameplay (which it may do in some aspects). The good thing is that there are alternatives. If believe zBase is going to be 100% glitch free.