So. Here's the motorcycles and the freight trains.

The motorcycles are (usually) fast and versatile, and can do a lot of different things. But when troubles (aka dudes with skull bandanas) show up, they can't hold more than one or two at a time before they crash. However, since motorcycles are relatively light, they can usually kick-start back pretty quickly. There are different varieties that take a bit longer to start back up, but those usually have the awesome 3-foot-long aero package to make up for it.

Now the freight trains. They barrel along, not even semitrucks can stop them. They can do a limited number of things, but they do them really well. And when the dudes with skull bandanas jump aboard, there's plenty of room, and they still keep right on truckin'. Eventually, tho, all the dudes with skull bandanas get to the conductor, and the entire train crashes, causing rampant devastation. It takes days or weeks to get a freight train back up and running again.

You'll get your occasional mopeds and jet planes, but those are the two basic groups.

Memoria!