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"Amtrak now has a 30% advantage on auto w.r.t. fuel economy". I don't doubt this statement. But it raises a few questions based on my Texas observations. The Texas Eagle arrives in San Antonio at 9:55 p.m., and departs the next morning at 7:00 a.m. During the night the locomotive pushes two cars around, but for the most part, as far as I can tell, the engine idles all night. In addition, the Eagle has some significant dwell times in Fort Worth and St. Louis, during which the engines idle. The Trinity Railway Express trains between Dallas and Fort Worth have end point dwell times of 25 minutes for each trip. The engines idle during these dwell times. How are these dwell times factored into the fuel consumption and pollution per passenger or passenger mile.  Also, how are the average load factors for the various modes of transportation factored into the calculations?
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