Thermal Technology hits the rails! Adds Thermal-style Minecarts and rails!
Sorry that the wiki isn't up to date yet, but basically the mod has the following things at the moment:
Crossover Rail - super simple, I know, but something that really should be in the vanilla game.
Prismarine - These work underwater and emit a low level of light. Standard variants + Crossover included.
Lumium - These emit a very high level of light. Standard variants + Crossover included.
Underwater Cart - Holds a large amount of air which replenishes when it surfaces. Continually fills the air meter of the rider, if it has supply. Can be enchanted with Respiration.
Various TNT Carts. :)
More stuff is coming! This is 1.15.2 only for the moment, but will be ported up ASAP.