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New York City Transit Hybrid and CNG Transit Buses: Interim Evaluation Results - page 47 / 64

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the four-wheel reline twice within three months. There were also some repairs for issues with the antilock brake system for the CNG and hybrid buses. More data is required for the hybrid buses to fully understand how much longer the hybrid buses can go between brake relines and what that cost savings might ultimately be.

Fleet West Farms CNG

Mileage 179,547

Parts Cost ($)

Labor Hours

Cost per Mile ($)

9,571.28

536.3

0.20

Mother Clara Hale Hybrid

194,395

1,373.64

116.9

0.04

Table 18. Brake System Maintenance Costs (Evaluation Period)

PMI This category only includes labor hours for inspections of multiple bus systems during preventive maintenance. As shown in Table 19, the CNG buses have PMI maintenance cost per mile 38% lower than the hybrid buses. However, for all maintenance costs per mile for scheduled maintenance, the CNG and hybrid buses had exactly the same cost at $0.29 per mile. The scheduled maintenance costs include filters and materials used as part of scheduled maintenance. One note here would be that some of the preventive maintenance parts for the hybrid buses may have been paid for under warranty and not accounted for in this cost per mile measure.

Fleet West Farms CNG

Mileage 179,547

Parts Cost ($)

Labor Hours

Cost per Mile ($)

0.00

465.7

0.13

Mother Clara Hale Hybrid

194,395

0.00

695.0

0.18

Table 19. Preventive Maintenance Inspection Maintenance Costs (Evaluation Period)

Frame, Steering, and Suspension This category includes repairs for the frame, steering, and suspension systems of the buses. As shown in Table 20, the CNG buses had maintenance cost per mile 25% lower than the hybrid buses.

Fleet West Farms CNG

Mileage 179,547

Parts Cost ($)

Labor Hours

Cost per Mile ($)

2,490.77

139.9

0.05

Mother Clara Hale Hybrid

194,395

3,717.55

182.2

0.07

Table 20. Frame, Steering, and Suspension Maintenance Costs (Evaluation Period)

Warranty Costs Maintenance costs that were covered under warranty were generally removed. NYCT requested that suppliers working on the CNG and hybrid buses enter mechanic time into the maintenance system. These labor hours were not included in the analyses presented in this report. The CNG buses had 45.2 labor hours removed from the analysis in this report and the hybrid buses had 96.25 labor hours removed. These labor hours were from Atlantic Detroit Diesel Allison (local dealer), Cummins, Vapor Corporation, and Orion.

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