I'm playing a heavy modpack with Bob's and Angel's, a rail system is needed for producing many things (a giant bus is impossible); it is not only useful for minerals.
Currently I'm using little locomotives added by Yuoki, but the recipes are quite complex and made with Yuoki items, so it would be nice having a mod with just a small loco and wagon, for shunting cargos around the base (maybe a little tanker too?). Recipes could be a more economic version of the standard locos and vagons. Let me know what you think
