On a cold day, a new train puffs out clouds that look like smoke, just like a traditional steam engine. But the train—which runs on hydrogen fuel cells, not coal—doesn’t create any climate emissions or air pollution. The only exhaust is water vapor.

The sleek blue train is the first of its kind in North America. Called a ZEMU, (zero-emissions multiple unit), it will soon begin carrying passengers between two cities east of Los Angeles, connecting commuters to other trains that travel to downtown L.A.

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