SEPTA mdbf per vehicle type

Hio,

Does anybody have data on the mdbf for the heavy rail rolling stock of SEPTA, broken down by vehicle type? The only published information just throws all heavy rail together (example http://www.septa.org/strategic-plan/goo ... -mdbf.html" onclick="window.open(this.href);return false;). This makes little sense, since the silverliner ii/v, locos and coaches are pretty diverse.

ant6n wrote:Hio,

Does anybody have data on the mdbf for the heavy rail rolling stock of SEPTA, broken down by vehicle type? The only published information just throws all heavy rail together (example http://www.septa.org/strategic-plan/goo ... -mdbf.html" onclick="window.open(this.href);return false;). This makes little sense, since the silverliner ii/v, locos and coaches are pretty diverse.

You mean the commuter rail vehicles? Heavy rail would connote the subway and el.

Sure, commuter rail.

What is MDBF?

In case others are also wondering, please answer directly, not with a suggestion that I Google it. If you want to link directly to a site that spells it out and defines it, please make it a supplemental to your answer, not your only answer.

Thanks in advance.

rslitman wrote:What is MDBF?

In case others are also wondering, please answer directly, not with a suggestion that I Google it. If you want to link directly to a site that spells it out and defines it, please make it a supplemental to your answer, not your only answer.

Thanks in advance.

Mean distance between failures.

For each vehicle, take the distance traveled between (as appropriate) the start of the measurement period or when it breaks and (as appropriate) the end of the measurement period or the next time it breaks.

Yeah sorry, I should've been more clear. The mean distance between failures gives an indication of how reliable equipment is -- but it doesn't mean that much if it isn't broken down by vehicle type. For the MTA, information can be found for example here: http://web.mta.info/mta/news/books/pdf/ ... R&LIRR.pdf" onclick="window.open(this.href);return false;

So for 2016, for Metro North, you get these values

M2: 29,016
M8: 400,116
M3: 101,097
M7: 425,292
Coach: 262,165
P-32: 23,999
BL-20: 31,272

Overall Fleet: 216,772

You see the old M2's are very unreliable compared to the newer M8 and M7 cars, the less old M3's are somewhere in-between. The engines are even worse (but there's only one engine per train, whereas EMUs will have up to 10 cars per train). You see the numbers will be very different depending on vehicle type, so it's not so useful to to throw them into one big average.

For comparison, the MBTA's commuter rail, by the most recent figures, has an MDBF of 3,800 miles....

leviramsey wrote:For comparison, the MBTA's commuter rail, by the most recent figures, has an MDBF of 3,800 miles....

Ha, what! Do you have a link for that?

ant6n wrote:

leviramsey wrote:For comparison, the MBTA's commuter rail, by the most recent figures, has an MDBF of 3,800 miles....

Ha, what! Do you have a link for that?

From the Boston Globe (partially paywalled)