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New DOB Fleet MDBF Numbers

 
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Q65A



Age: 68
Joined: 17 Apr 2007
Posts: 1796
Location: Central NJ
PostPosted: Mon Dec 03, 2012 9:42 pm    Post subject: New DOB Fleet MDBF Numbers Reply with quote
As seen tonight on BusChat:

Numbers are year-to-date...
MDBF= Means Distance Between Failures (in miles)
MPG= Miles Per Gallon

Systemwide MDBF average is 4,458.


TEST BUSES GROUP (Orion VII EPA 2010; Nova LFS-40ft; New Flyer XD40) - "together" MDBF: 12,410... 3.3 MPG.

-vs-

12+ year old (RTS/Orion V) buses: MDBF: 2,800... 2.6 MPG


--------------------------------------------------------------------------------

NEW- 2011/2012 New Flyer C40LF: MDBF: 8,400... 2.37 (equivalent) MPG

-vs-

OLD & nearly extent- 1999/2000 New Flyer C40LF: MDBF 3,605... 2.06 (equivalent) MPG


--------------------------------------------------------------------------------

Prevost X3-45 average MDBF: 12,300... 3.72 MPG

-vs-

12+ year old MCI D4500 average MDBF: 5,400.... 3.34 MPG


--------------------------------------------------------------------------------

Nova LFS artics MDBF: 5,600.... 2.67 MPG

-vs-

12+ year old New Flyer D60HF MDBF: 2,200... a dismal 1.90 MPG

I suppose that brand new buses equipped with the latest powertrain technology, theoretically at least, should be posting some good early numbers.
Note that there are no HEV's in the mix at this time.
Perhaps the early "teething pains" and later maintenance costs of their HEVs motivated DOB to evaluate "clean diesel" and CNG powertrains.
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Q65A



Age: 68
Joined: 17 Apr 2007
Posts: 1796
Location: Central NJ
PostPosted: Mon Dec 03, 2012 9:45 pm    Post subject: Reply with quote
One of the first questions raised by these fresh metrics: are artics inherently failure-prone?
I ask this question only because the brand-new Nova LFSA's have significantly lower MDBF's than all other units.
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RailBus63
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Joined: 16 Apr 2007
Posts: 1063
PostPosted: Tue Dec 04, 2012 9:02 am    Post subject: Reply with quote
Q65A wrote:
One of the first questions raised by these fresh metrics: are artics inherently failure-prone?
I ask this question only because the brand-new Nova LFSA's have significantly lower MDBF's than all other units.


It appears so - the MDBF numbers I've seen in the past from NYCT had the New Flyer D60 artics with the lowest reliability numbers by far, and cities like Mississauga Ontario which have often run their 40-foot buses past 15 years typically retire articulated buses right at the 12-year mark. It probably has something to do with wear and tear on the articulation joint and possibly issues with the anti-jackknife system that is necessary in 'pusher' artics (those with a rear-mounted engine like a standard rigid bus).

Jim D.
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