In Bloomberg's article, “Want More Trains and Subways? Build Smaller Stations,” the Transit Cost Project is discussed:
The puzzle of America’s exorbitant infrastructure costs remains fascinating, and it’s part of an even more fascinating puzzle of declining productivity in the construction sector overall. But there are easy parts of even hard problems. All of which is to say: Maybe America can’t quite figure out a realistic and efficient way to build great public infrastructure. But it can, and should, build smaller train stations.