I don't know if anyone has suggested this before, but for example you could make faster trains by putting a special furnace on the train and if you power it with coal then the train will go faster. Like in the mod Valkyrien Skies/Eureka.
#Faster trains.
fallen zinc
short dune
If you have coal in a chest or vault or whatever on your train it'll be consumed and the train will go faster
fallen zinc
Really? I didn't know that.
hasty quartz
Really? I didn't know that.
xD