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"Regional Rail ridership is up 50 percent over the past 10 years," he said. "And we have made some improvements in our infrastructure, including installing turnback switches on the Manayunk/Norristown and Chestnut Hill East lines."These switches will permit short-turning of trains, a key element in providing more frequent service. Knueppel said that with the improvements, it will be possible for SEPTA to operate trains on these two lines at half-hourly intervals off-peak, and that such service is likely to be implemented in the next few years.