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Mean Distance Between Failures for New York City Transit's Subway Cars

CAR      May 94         June 95
          miles        #    miles
         ------      ---  -------
R26      47,115      110   21,557
R28       "  "       100   24,011
R29       "  "       236   42,584

R32      45,385      594   55,726
R33      72,381      533   44,153
R36      41,656      424   41,148
R38      67,271      196   57,564
R40      52,084      394   90,758
R42      32,464      392   64,323
R44      85,273      278   79,892
R46      82,154      752   54,399
R62      94,065      323  135,262      (May 93 = 228,658)
R62A     65,629      825   59,102
R68      34,065      425   59,908
R68A     53,364      200   43,608
R110A                 10   27,800
R110B                  9  No Fail  

FLEET              5,801   55,724


(R26, R28 and R29 averaged together in May 94 listing)
(The R110B had no failures during June 95)