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New York City Transit Hybrid and CNG Transit Buses: Interim Evaluation Results - page 39 / 64

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39 / 64

7657

, 18 708

4,820.41

390.0

1.30

7662

19,419

4,444.86

368.3

1.18

7666

13,087

8,316.46

433.5

2.29

7670

17,938

6,021.11

348.5

1.31

7677

17,993

8,156.55

417.9

1.61

7688

18,516

5,730.23

330.5

1.20

7708

19,344

5,141.26

333.6

1.13

7715

18,313

3,976.66

329.4

1.12

7719

17,483

4,936.99

282.9

1.09

7721

18,746

4,112.70

324.2

1.08

Total CNG

179,547

55,657.23

3,558.5

1.30

Avg. per Bus

17,955

5,565.72

355.9

--

6367

16,812

4,711.21

391.3

1.44

6368

18,465

2,677.03

396.9

1.22

6369

18,545

3,820.93

400.9

1.29

6375

21,252

2,569.34

384.6

1.03

6378

20,534

3,412.69

386.9

1.11

6379

20,453

5,469.01

479.2

1.44

6380

16,963

2,224.94

282.5

0.96

6381

19,470

3,238.01

396.2

1.18

6382

21,043

2,842.97

407.6

1.10

6387

20,858

3,486.36

393.1

1.11

Total Hybrid

194,395

34,452.49

3,919.0

1.19

Avg. per Bus

19,440

3,445.25

391.9

--

higher than the rest. These higher total maintenance costs were caused by significant repairs troubleshooting the hybrid propulsion system, hydraulic pump, PCS cooling system, doors, and air conditioning. Most of these significant repairs are a part of the aforementioned campaigns for the hybrid buses.

The total maintenance cost for the CNG buses was 8% higher than the hybrid buses. This difference will be explored further in the next discussion about maintenance cost breakdown by vehicle systems.

Table 11. CNG and Hybrid Bus Total Maintenance Costs

Bus

Cost per Mile ($)

(Evaluation Period)

Mileage

Parts ($)

Labor Hours

Maintenance Cost Broken Down by System Table 12 shows maintenance costs by vehicle system and bus study group. The vehicle systems shown in the tables include the following:

  • Preventive maintenance inspections (PMI)—Labor for inspections during preventive maintenance

  • Tires

  • Propulsion-related systems—Repairs for exhaust; fuel; engine; electric motors, traction batteries, and propulsion control; non-lighting electrical, air intake, cooling, and transmission

34

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