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New York City Transit Hybrid and CNG Transit Buses: Interim Evaluation Results - page 10 / 64





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Table ES-3. Summary of Propulsion-Related Maintenance Cost per Mile Comparisons*


Hybrid vs. CNG

Total Propulsion-related

9% (higher)

into a fuel cost per mile 53% higher than the hybrid buses. The fuel cost per mile comparisons between CNG and diesel fuel may change considerably during the rest of the evaluation (June through September 2005) because of significant fuel price changes during that period.

Total Maintenance Costs Total maintenance costs include mechanic labor at a standardized $50 per hour rate (this is not a NYCT mechanic labor rate) and parts, with no warranty costs included. The CNG buses’ average total maintenance cost was 8% higher than the hybrid buses during the evaluation period.

It is early in the implementation process of the hybrid and CNG buses and the buses have had many repairs covered under warranty. Orion is in the process of completing a significant maintenance campaign for the entire Orion VII fleet at NYCT, which is planned to be completed by the end of calendar year 2005.

Propulsion-Related Maintenance Costs Propulsion-related maintenance costs include repairs for transmission, non-lighting electrical (charging, cranking, and ignition), air intake, cooling, exhaust, fuel, engine, and electric propulsion. The CNG buses’ average propulsion-related maintenance costs were 9% lower than the hybrid buses. A summary of propulsion-related maintenance cost comparisons is shown in Table ES-3.

Exhaust Fuel Engine

Electric Propulsion

111% (higher)

    • -

      77% (lower)

  • -

    2% (lower or same) N/A

    • -

      58% (lower)

    • -

      38% (lower)

    • -

      13% (lower) N/A

Non-Lighting Air Intake Cooling Transmission


  • *

    The cost comparisons are provided as hybrid compared to CNG as the baseline.

((Hybrid cost per mile/CNG cost per mile) – 1) * 100% = Percent comparison For example, the total propulsion related entry is 9% higher, this is hybrid costs being 9% higher than CNG for this category.

In this report, a roadcall (RC) is defined as an on-road failure of an in-service bus, which results in a bus being taken out of service or replaced on-route. RCs are a direct indicator of reliability for transit buses. MBRC is the typical measure for RC performance for transit buses. NYCT expects transit buses to meet or exceed a rate of 4,000 MBRC for all RCs. The CNG buses had a rate around 5,000 MBRC compared to the diesel baseline group, which had around 2,000 MBRC. The hybrid buses had a rate around 7,000 MBRC, and the diesel baseline group had around 5,000 MBRC. The diesel baseline group at West Farms is well below the NYCT expectations; the CNG buses and diesel baseline group at Mother Clara Hale Depot are both just


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