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Hi Ernie,
Hey! If your going to fill up the train with people, then you got to fill up the Prius with people too. That makes for a 131/2 = 65.5 gmC02/passenger mile.
On your Cd question, yea, .025 might be doable. That is the Cd similar to a passenger aircraft such as a 787. The vehicle would need to have some sort of struts down to the track to support it high above the track to avoid compressibilty drag between the track and the body. The struts need to have minimun section area. Kinda like wings.
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