Toyota City: Toyota President Akio Toyoda on Tuesday unveiled the assembly line that is making the first mass market fuel-cell car.

The world’s biggest carmaker plans to produce 700 units of the four-door Mirai sedan — powered by hydrogen and emitting nothing but water vapour from its tailpipe — by the end of December. Production of the car whose name means “future” in Japanese is scheduled to expand to 2,000 units in 2016 and 3,000 units in 2017.