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New York City Transit Hybrid and CNG Transit Buses: Interim Evaluation Results - page 19 / 64

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Number of Buses

10

9

10

9

Bus Manufacturer and

Orion VII, Low

Orion V, High Floor

Orion VII, Low

Orion V, High Floor

Model

Floor

Floor

Model Year

2002

1994

2002

1999

Length/Width/Height

40 ft/102 in/135 in

40 ft/102 in/121 in

40 ft/102 in/132 in

40 ft/102 in/121 in

GVWR/Curb Weight

42,540/31,400 lbs

40,000/28,500 lb

42,540/31,840 lb

40,000/28,500 lb

Passenger Capacity

37 Seated,

39 Seated,

38 Seated,

39 Seated,

36 Standing

36 Standing

32 Standing

36 Standing

Engine Manufacturer

DDC S50G

DDC S50

Cummins ISB

DDC S50

and Model

(not EGR equipped)

Rated Horsepower

275 bhp @ 2,100

275 bhp @ 2,100

270 bhp @ 2,500

275 bhp @ 2,100

rpm

rpm

rpm

rpm

Rated Torque

900 lb-ft @ 1,200

890 lb-ft @ 1,200

660 lb-ft @ 1,600

890 lb-ft @ 1,200

rpm

rpm

rpm

rpm

Emissions Equipment

None

Retrofit DPF,

Engelhard DPX

Retrofit DPF,

Johnson Matthey

Johnson Matthey

Retarder/Regenerative

Retarder

Retarder

Regenerative

Retarder

Braking

Braking

Fuel Capacity

125 diesel

125 gallons

100 gallons

125 gallons

equivalent gallons

Bus Purchase Cost*

$313,000

$290,000

$385,000

$290,000

  • *

    Costs listed in the table are actual costs at the time of purchase

Hale Depot Diesel Baseline

Vehicle System

CNG Buses Table 3. Vehicle System Descriptions West Farms Depot Diesel Baseline Mother Clara Hybrid Buses

CNG and Diesel Baseline Vehicle Differences There are significant differences between the CNG and diesel baseline study groups at West Farms. The most important issue is the age difference between the fleets. This matters because the maintenance costs increase over time and significantly after five or six years of service life because of major repairs to components such as the transmission. Other differences include:

  • The CNG buses are low floor and the diesel buses are high floor.

  • The CNG buses have slightly higher maximum torque than the diesel buses.

  • The diesel buses have a retrofitted DPF installed and the CNG buses have no exhaust aftertreatment.

  • The CNG buses are heavier than the diesel buses and this slightly changed the number of maximum passengers allowed on the CNG buses versus the diesel buses.

  • The CNG buses were approximately $23,000 more expensive than the diesel buses.

Hybrid Buses at Mother Clara Hale Ten hybrid buses from the order of 125 hybrid buses were selected from the Mother Clara Hale Depot. The hybrid buses are Orion VII low floor buses and use a smaller-than-standard diesel engine (5.9 liter versus an 8.3 or 8.9 liter engine) from Cummins Engine Company. The hybrid buses are equipped with an Engelhard DPXTM for exhaust aftertreatment. This DPF is actively monitored and regenerated (as needed) as part of the BAE Systems HybriDrive hybrid propulsion system. Table 4 provides descriptions of some of the electric propulsion system.

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