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New York City Transit Hybrid and CNG Transit Buses: Interim Evaluation Results - page 49 / 64

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30000

Miles Between Roadcalls (MBRC)

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Jun- Jul-04 Aug-

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Diesel WF

CNG

Diesel MCH

Hybrid

Figure 19. Cumulative Average MBRC, Propulsion-Related Only

Table 21 provides a summary of the RCs for each study group of buses for the evaluation period. The diesel buses at West Farms had the most RCs for doors and interlock, cooling (hydraulic fan), and engine. The CNG buses had the most RCs for non-lighting electrical (mostly for problems starting), doors and interlock, and engine. The diesel buses at Mother Clara Hale had the most RCs for doors and interlock, non-lighting electrical, and wheelchair lift/ramp. The hybrid buses had the most RCs for the electric propulsion system and air system. The electric propulsion system RCs were mostly caused by “check” or “stop” HEV lights.

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