Tank Cart

A Fluid tank inside a Minecart. Holds 16 Buckets worth of liquid. Used with the Fluid Loader and Unloader. Craft with a fluid container or place a fluid container in the filter slot to specify that this Tank Cart only holds one kind of fluid.

Cargo Cart

Unlike the Chest Cart, Cargo Carts can only hold 1 type of item, but they can hold a lot and visually show what item they're holding in the Minecart.

This was added in Railcraft 9.8.0, released on October 21, 2015.

Redstone Flux Cart

Added in Railcraft 9.11.0 (released on May 11, 2016), these carts transport RF Power and can store up to 2 million RF, Used with the RF Loader & Unloaders.