WASHINGTON  President Obama on Thursday highlighted his ambition for the development of high-speed passenger rail lines in at least 10 regions, expressing confidence in the future of train travel even as he acknowledged that the American rail network, compared with the rest of the world’s, remains a caboose.

With clogged highways and overburdened airports, economic growth is suffering, Mr. Obama said at the Eisenhower Executive Office Building, shortly before leaving for a trip to Mexico and then Trinidad and Tobago.

“What we need, then, is a smart transportation system equal to the needs of the 21st century,” he said, “a system that reduces travel times and increases mobility, a system that reduces congestion and boosts productivity, a system that reduces destructive emissions and creates jobs.”

And he added, “There’s no reason why we can’t do this.”

Mr. Obama said the $8 billion for high-speed rail in his stimulus package  to be spent over two years  and an additional $1 billion a year being budgeted over the next five years, would provide a “jump start” toward achieving that vision.