The RC01 grinding train uses 48 stones per rail, divided over four grinding units.

RC01打磨列车打磨每段钢轨需要48块磨石，这些磨石共分配到四个打磨单元中。

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"At a per-passenger-mile basis, rail is about three times as efficient as travel by car, in terms of fuel efficiency, and six times as efficient as travel by air, so there are pretty substantial pollution reduction benefits both in terms of greenhouse gases and other pollutants."

VOA: standard.2010.02.15

"We are not opposed to the need for higher speed rail per se and fully acknowledge the need for strategic improvement to the national rail infrastructure, but cannot agree with the current proposals as the economic and environmental benefits are not at all credible, " it said.

BBC: High-speed rail not in UK's best interest, council claims

To take it a step further, according to USDOT statistics, pipelines are 451 times safer than rail on a per-mile basis.

FORBES: Pipeline Infrastructure: Rhetoric v. Reality

It was estimated in the EIS, rail would cause 8% more greenhouse gas per year than the XL pipeline.

FORBES: Why Rail is a Dead End Alternative to Building the Keystone Pipeline