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New York City Transit Hybrid and CNG Transit Buses: Interim Evaluation Results - page 45 / 64

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included the accelerator, two major engine repairs, one significant charging repair, one multiplexer/communications system repair, one exhaust system repair, and one significant transmission repair. All of these actions appear to coincidentally occur in April 2005 and do not appear to be related.

For the hybrid buses, the monthly maintenance costs for propulsion-related systems steadily increased during the evaluation period. The maintenance issues appear to mostly involve the hybrid propulsion control system and the engine. In April 2005, there was a traction battery replacement (bus 6382) and a triple pump replaced (bus 6375). There were significant cooling and exhaust/DPF repairs as well. The increased propulsion-related maintenance costs were most likely related to an investment in mechanic time for troubleshooting and on-the-job training. This is an indication of the depot staff coming up to speed in how to repair the hybrid buses on their own. This level of mechanic time may decrease over time as the mechanics become more experienced with the hybrid buses.

Cab, Body, and Accessories Systems The vehicle systems included in this grouping are shown in Table 16. The maintenance costs associated with these systems are shown by bus study group. The following bullets describe each of the subsystem divisions chosen to break down this category.

  • Door and interlock—Includes anything that has to do with the doors and interlock system except for the brakes

  • Wheelchair lift/ramp—Includes all repairs for the wheelchair lift or ramp systems, except hydraulics

  • Body exterior—Includes all body panels and compartment doors, as well as reflectors

  • Cleaning—All cleaning activities inside and outside the bus

  • Mirrors—All inside and outside mirrors

  • General interior and seats

  • Windshield wipers—Includes the wipers, motors, and washer systems

  • Supplies and expendable items—Includes painting supplies, tools, wipes, eyeglasses, and coveralls assigned to a bus

  • Destination signs

  • Horn

  • Farebox

  • Fire extinguisher

  • Radio

The CNG and hybrid bus study groups had essentially the same cost per mile for this category. The breakdown of the makeup of the subdivision costs is slightly different for each bus group.

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