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New York City Transit
Subway: Mean Distance Between Failures

Graph of New York City Transit Subway Mean Distance Between Failures Performance Indicators

Sep 2008: 127,214 miles Oct 2007 — Sep 2008: 136,152 miles
Sep 2009: 159,851 miles Oct 2008 — Sep 2009: 142,961 miles

Subway Mean Distance Between Failures (MDBF) is the primary cause of subway car fleet reliability and is calculated as revenue car miles divided by the number of delay incidents attributed to car-related causes.