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New York City Transit Hybrid and CNG Transit Buses: Interim Evaluation Results - page 26 / 64

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Of these three topics, reliability (MBRC) is the only one covered in this report. Availability and recovery time were not available for this study, but are implied in bus usage levels.

CNG Buses NYCT has 481 CNG buses split between the West Farms and Jackie Gleason depots. The addition of significantly more CNG buses would require another depot to be converted to CNG fueling and maintenance operations. The cost of this conversion was estimated to be higher than NYCT is willing to pay as long as diesel hybrid buses are a viable option in purchase and operations costs.

NYCT was an early adopter of CNG transit buses. In 1995, it purchased 34 CNG buses; this number grew to 221 by 2001. These CNG buses were operating at Jackie Gleason Depot. As mentioned earlier, NYCT purchased 260 new CNG Orion VII buses. There were some delays in delivery of these buses due to Orion’s delays in meeting NYCT’s rigorous structural qualification requirements.

The 260 CNG Orion VII buses were delivered and placed into service from March 2003 through approximately November 2004. Jackie Gleason Depot started its first new CNG bus in service in March 2003; West Farms Depot started its first new CNG bus in service in September 2003. Figure 7 shows total mileage accumulation at the two CNG bus depots. At the end of May 2005, the total Orion VII CNG fleet had reached 9.5 million miles of operation. Figure 8 shows average monthly mileage per CNG bus at the two CNG depots. This figure shows that the CNG buses were placed into service quickly and met an average usage per month of 2,300 to 2,500 miles per month.

Total Miles

Mar-

May-

Jul-

Sep-

Nov-

Jan-

Mar-

May-

Jul-

Sep-

Nov-

Jan-

Mar-

May-

03

03

03

03

03

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05

10,000,000

9,000,000

8,000,000

7,000,000

6,000,000

5,000,000

4,000,000

3,000,000

2,000,000

1,000,000

0

Jackie Gleason Depot

West Farms Depot

Total Mileage

Figure 7. CNG Bus Fleet Cumulative Mileage

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