Smart Sensor System for Monitoring Railcar Braking Systems, HSR 51 Final Report Socie, D. and C.P.L. Barkan. 2008. Smart Sensor System for Monitoring Railcar Braking Systems, HSR 51 Final Report. High-Speed Rail IDEA Program, Transportation Research Board, National Research Council, Washington, DC. Files Smart Sensor System for Monitoring Railcar Braking Systems, HSR 51 Final Report - Full Text (PDF) Categories Infrastructure