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New York City Transit Hybrid and CNG Transit Buses: Interim Evaluation Results - page 46 / 64

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46 / 64

Mile ($)

(%)

Mile ($)

(%)

Doors and Interlock

0.05

13

0.11

28

Wheelchair Lift / Ramp

0.04

11

0.04

9

Body—Exterior

0.13

34

0.09

23

Cleaning

0.07

18

0.06

15

Mirrors

0.02

6

0.03

8

General Interior and

0.03

8

0.03

8

Seats

Windshield Wipers

0.02

6

0.01

3

Supplies and expendable

0.00

0

0.00

0

items

Destination Sign

0.00

0

0.00

0

Horn

0.01

4

0.01

3

Farebox

0.00

0

0.00

0

Fire Extinguisher

0.00

0

0.01

3

Radio

0.00

0

0.00

0

Total

0.38

100

0.39

100

HVAC This category includes all maintenance actions for heating and ventilation and the air conditioning system. The majority of the costs in this category are typically related to the air conditioning. The maintenance costs for the two study groups are shown in Table 17. The maintenance cost per mile for the two study groups are about the same with the CNG buses being 29% lower than for the hybrid buses. For the hybrid buses during the evaluation period, eight of the 10 buses had an inspection and repairs that took 16 hours of mechanic time each.

Table 16. Breakdown of Cab, Body, and Accessory Maintenance Cost per Mile

Subsystem

(Evaluation Period) CNG West Farms

Cost per

Percent

Hybrid Mother Clara Hale

Cost per

Percent

Fleet West Farms CNG

Mileage 179,547

Parts Cost ($)

Labor Hours

Cost per Mile ($)

3,715.98

182.6

0.07

Mother Clara Hale Hybrid

194,395

1,906.13

321.5

0.09

Table 17. HVAC System Maintenance Costs (Evaluation Period)

Brakes The brake system maintenance costs are expected to be dramatically lower for hybrid propulsion systems with regenerative braking. The regenerative braking allows the electric drive motors to be used to slow down a bus like a transmission retarder. The energy from braking is taken into the electric motor and then fed back to the traction batteries. Diesel and CNG buses are expected to have a four-wheel reline of the brakes every 18,000 miles on average.

Table 18 shows the maintenance costs for the brake system repairs for the two study bus groups. During the evaluation period, the CNG buses had 82% higher brake maintenance cost per mile compared to the hybrid buses. The five oldest CNG buses in the study group had at least one four-wheel reline of the brakes during the evaluation period. One of those five CNG buses had

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