There are some repairs and parts costs that are most likely included in these analyses; however, there was no indication in the NYCT maintenance system to make a decision to remove the data. As an action item for the final report, an investigation of available information on warranty claims will be made. If more information regarding warranty claims can be found, the confirmed costs claimed on warranty will be removed.
Figure 18 shows the cumulative average miles between roadcalls (MBRC) for all RCs for the CNG, Hybrid, and two diesel baseline fleets. With an average of 2,000 MBRC, the diesel buses at West Farms are well below NYCT’s expectation that all buses should meet or exceed 4,000 MBRC. Both the diesel buses at Mother Clara Hale Depot and the CNG buses are above the goal at around 5,000 MBRC. The MBRC of the hybrid buses has started to settle around 7,000 MBRC—well above the MBRC of the other three study groups.
Miles Between Roadcalls (MBRC)
Figure 18. Cumulative Average MBRC
16000 14000 12000 10000 8000 6000 4000 2000
Jun- Jul-04 Aug-
Figure 19 shows MBRC for RCs that involved the propulsion-related systems in all four of the study groups. Propulsion-related systems include the transmission, non-lighting electrical (general electrical, charging, cranking, and ignition), air intake, cooling, exhaust, fuel, engine, and electrical propulsion. RCs for June 2004 and July 2004 were not available for the diesel buses and are not included in the figure.
The CNG buses had a RC rate 56% better than the diesel buses at West Farms Depot. The hybrid and diesel buses at Mother Clara Hale Depot have essentially the same rate with the hybrid group at 2% higher. The hybrid buses have a rate 38% higher than the CNG buses.