The ability to make your vehicle move is, one would think, central to the idea of a vehicle! For each environment in which your vehicle can operate, select at least one motive system. Aircraft should also look at Lift Systems.

First available at TR-1, this includes a variety of propellors and jet engines. Some spacecraft engines can also be found here, as they are equally capable of propelling an aircraft.

Some of these propulsion systems generate their own power, such as rockets or jet engines. Others, like propellors and reactionless thrusters, will require an installed powerplant.

Primarily intended for spacecraft, this category covers three different technologies for FTL travel. Of course, if your setting uses some sort of external FTL device—such as a stargate—then you don't need to install one of these.

All of these will require installed powerplants, but the nature of those plants varies wildly from drive to drive.

This includes wheels, tracks, skis and leg drivetrains, as well as combinations of these. All of these will require a powerplant to be installed.

Static lift can cancel out the mass of a vehicle. However, these are really only available in two formats: gas bags and contragravity. Gas bags were technically obsolete before they were even invented, and contragravity is superscience.

Contragravity will require installed power; gas bags do not.

This includes a variety of reaction drives, as well as the science-fictional reactionless and gravity drives. Most of the latter will also appear under Air Propulsion.

Some of these engines—most notably rockets—will generate all the power they need internally. Most of them, however, will require you to install a powerplant.

This category includes a number of ways to propel a surface ship, some of which are also suitable for a submarine.