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light rail?  This is important because we need to save energy by making lighter transit cars..With the stop and starts its takes more inertia to move a transit car as opposed to a automobile on the highway which just moves...Our city buses are about 20,000 lbs (I think) and the old PCC trolleys were only 25,000 lbs (The 5,000 lbs for the rail axles?)...So if a light rail vehical is running with 40 passengers mid day thats about 1,300 lbs of weight per passenger as opposed to 2,500 to 3,200 lbs for the avarage auto car...but if the car has 2 people that autoweight per passenger is devided in half so its about the same energy requirments to move a passenger by a modern light but really heavy trolley car as it is for a 2 person SUV in the car pool lane...and without the energy waisting stops and starts either
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