Redundant Power

Why can't we use Steam-Power Engines in vehicles?

I had reviewed information which showed how technology made it easier to use electricity to quickly heat water-even if frozen solid. Frozen water was an issue for the North in Winter. Steam out sold electric and gas cars for a while, but with gas being so cheap in the day, and the wait time for the steam to generate, the Gas car won out. Today the technology is here to use various liquids for steam. Recycle/return exhaust systems to make steam vehicles more economical. With less maintenance and materials needed- no Transmission- braking and throttle are all reliant upon the steam power. The vehicle would be much safer from the redundant exhaust systems...No Fires from accidents...
Steam cars were around back in the 1790's and the land speed record set in the late 19th Century was 225mph.
The Steam engine is listed as the most efficient engine.
the engine can use generators and make electricity for other power-systems and perhaps be steam/electric hybrid. I need more insight.

Power stations (both nuclear and coal fired) use steam power. Steam is a very efficient way to generate electricity.
Steam is not used in vehicles mostly because of the power to weight ratio. You have to carry a lot of weight and build a chassis to hold it. You have to accelerate the weight and you have to be able to stop it.

While it is a very efficient way to produce usable energy. The boiler and associated plant is heavy.

Of course using electricity produced from steam is a viable option. Things like electric trains run on this sort of energy. They are very efficient because they do not carry batteries and can carry heaps of payload (people).

Perhaps a similar pickup system could be used on our road systems allowing people to drive a very light (aerodynamic)vehicle. This would use heaps less energy than the current transport system.

250 watts (0.25 hp) can propel a light vehicle @ 54km/h (32 mph). 1.2 Kw (1.6 hp) @ 100km/h 62 (mph).

Example m5 recumbent (full fairing)

http://www.m5-ligfietsen.nl/site/EN/Models/Carbon_Low_Racer

PS3500 N+1 Redundant Power Supply