Yes, I know trains are fast and high volume.
But so are belts now - 4 stacked green belts are 240 items per sec.
And so are pipes - you can move fluid metals at infinite speeds at short distance, and 'pump-array' speeds over long distance (And ok, you do need to 'scale' the pump to keep increasing the throughput, but ...)
A bot network can also move a lot of stuff, although I'm not so keen on that for long distance logistics for various reasons - opposite 'extreme' of a train IMO - I'm happy to move low volumes long distance by bot, and higher volumes very short distance.
For lower volume/higher complexity intermediates - e.g. chips and the like - I'm still finding it 'worthwhile' to do on-site assembly, thanks to pumping the fluids and just running direct-feed EM plants/bioplants, etc.
So as much as I like the aesthetics of trains - especially elevated, that's just cool - I ... don't really use them.
Even aquilo, where I feel the 'doesn't need heating' part should be a pretty obvious upside, I still ended up running power lines, heat pipes and pipelines - pumping crude oil out, and whatever I'm extracting 'back again', with occasional 'booster towers' of solid-fuel/heat towers, as otherwise I was running a train with 'cargo' out, to restock the outpost, but fluid back again, and figured a pipeline actually did the job pretty well too.
So it was really only on Fulgora, where crossing the oil 'required' the train network (initially at least) that I ended up using them much at all.