Actually, yes, we are. I'll give you an example of looking at integrating a fuel cell into a light rail transit train that would generate electricity that would then feed motors to drive the wheelset.
There are similar sorts of areas with fuel cells in airplanes. In some work we just completed with Boeing, we put in a fuel cell to drive the auxiliary electrical load for a plane. It fits into a plane like a cargo container. The fuel cell sits in there with the self-contained fuel and provides auxiliary power. Again, that's electrical generation.
Much of the work in shipping is moving more towards what I would call the hybrid electrical system, in which you have internal combustion engines and battery sets in parallel, or some form of storage. That way they can put the power system higher up in the ship and they can remove the ducting for the exhaust and the air supply systems that have to go all the way through to the bottom of the ship.
There are a lot of crossovers of this technology into other transportation modes. Electrical drives are becoming fairly common in most transportation vehicles. The prime mover for that is still a question. It may be internal combustion, fuel cell, or battery, but the electrical motor seems to be becoming a more common method of driving the actual wheel itself.