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Allhough few Americans would choose passenger trains today for trips over 100 miles, a majority favor improvements in the quality and availability of rail travel, pollster Louis Harris reported yesterday.</br></br>Detailing results of a nationwide public opinion sampling, conducted by Louis Harris & Associates at the request of Amtrak, the pollster told a .National Press Club news conference that a growing percentage of Americans believe they will travel by train more in the future.</br></br>The Harris report was based on telephone interviews between Feb. 11 and Feb. 22 with a national sample of 1,600 persons plus more extensive samples of persons residing in five intercity rail corridors.</br></br>Publication of the data comes as Amtrak, the government-subsidized National Hail Passenger Corp., is facing the prospect of cutting hack on services if federal financial aid is not expanded.</br></br>According to Harris. 56 percent of those persons polled would choose a car for trips over 100 miles. 28 percent would pick airplanes. 8 percent favor buses and 6 percent would choose trains. For travelers living in areas where train service is available, the