Just like a liberal to misunderstand basic physics.
Trains and busses are only more efficient than cars if they never, ever stop. It takes huge amounts of energy to get that train or bus moving again once it has stopped. Much, much more than the lighter weight and more fuel-efficient automobile.
That's why rail is a mid-18th to 19th century solution to a 21st century problem. It's like suggesting we go back to telegraphs as the next step forward for the internet.