Specifically Keystone or others?
Well, this is interesting. The 47 times figure came from an industry article I read years ago. I found plenty of recent articles that said pipelines were cheaper, but nobody gave a figure, which I find odd. One article was written to favor rail transport. But recently the government has declared that all rail vehicles must, essentially, be puncture and accident proof. This will cost billions and every current rail car is obsoleted, so rail costs will go even higher. I suspect that rail cars, which are much riskier, benefit from superior lobbying.
Below is a link to the gas and oil pipeline maps, putting the lie to the fact that we don’t have more room for pipelines.