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Everything posted by Bus_Medic

  1. MiWay

    Yeah, they could. But that would probably land them in court if they’re not building to their own design, and fork out for all the testing needed to get said design transport Canada approved. the TTC once mused about constructing its own buses from scratch. It wasn’t the nuts and bolts, or tooling that stopped them.
  2. MiWay

    -repeat as necessary.
  3. Cummins

    MCI tag steering traditionally locked straight at speeds of 20mph and above. Unless something has been revised in the last 15 years or so, they still do. Also, up until the early ‘2000s, the DL3s used a passive steering system, that only adjusted the axle caster to be slightly negative, and unlocked the tag axle tie rod, so the wheels would track opposite of the front wheel much like the front wheel on a shopping cart. Retractable midship helper axles on semi trailers operate similarly. It was the renaissance and J models that pioneered the hydraulic slave cylinder steering. (Later adopted to the D model IIRC....I was 100% in the transit end by the time that happened) Tag steering just isn’t that responsive. It’s too close to the fulcrum to affect anything at speed. If anything, it’s job is to act something like a straight ahead rudder, and to shorten stopping distances.
  4. Cummins

    I think Newell did it for their rear engine motor homes at one point, or maybe it was blue bird. It might help, but any wheelbase that long being shoved from the rear is going to be dicey in slick conditions.
  5. Cummins

    I’d suggest tandem drive axles if to want to put all that to the road.
  6. Société de transport de Montréal

    This is a long standing practice in the trucking industry. It’s called tire siping. https://en.wikipedia.org/wiki/Siping_(rubber)
  7. TTC Orion VII Retirements

    I was responding to leyland. - You can figure it out yourself.
  8. TTC Orion VII Retirements

    It has everything to do with the emissions, and the convenient timing of the PTIF funding.
  9. Miscellaneous TTC Discussion & Questions

    Those switches and intersections are “flange bearing” and are shallow by design. Weight is transitioned by gradually reducing the depth of the flangeway, to the point where the typical “tread” area is off the ground. reduces impact forces as the wheels ride on a more continuous, uninterrupted surface. This differs from usual heavy rail convention of deep flangeways. However, “one way low speed” crossings are a more recent innovation becoming more common in heavy rail, where one route will be flange bearing, especially where the one route of the intersection sees much less traffic than the other.
  10. Any car enthusiasts here?

    Trabant. -That is all.
  11. Grande West Transportation

    To nitpick, what about the few running around st. Jean sur Richelieu?
  12. Cummins

    Can’t really answer, haven’t dealt with them in my career thus far. Had some voith experience in my apprenticeship, at SN, but ZF was purged from the TTC fleet by the time I was hired in 2004. Dealt with CAT C10s and 3176s in MCI products....was never that enamoured with them. Keep a spare water pump in the luggage bay...you’ll need it.
  13. Today's Sightings

    It’s great, because I know to skip over this thread 9 times out of ten. Saves time and data.
  14. Cummins

    Just saving money on R&D probably... guess it was more cost effective to buy Cummins and check off that box for the manufacturer to do list. -same as Dodge, or Nissan just buys the crate diesel, rather than designing their own from scratch. I’ll admit that Cummins has an edge there..It’s all they do. No need to distract their engineers with designing the rest of the vehicle it’ll be going in. Some bathroom reading to get you all started: http://www.paccar.com/news/archived-news/2006/paccar-and-cummins-announce-class-67-engine-agreement/
  15. Cummins

    Funny, I thought greater noise reduction in a bus was an asset. man, was I wrong on that. 🤦‍♂️ IIRC, the MX11, etc from DAF are their own, whereas the corporate parent’s Pacccar PAC 6 and PAC 8, are effectively Cummins clones.
  16. GO Transit

    I like my response better. It’s less vague. seeing as how the ep40 or 50 or whatever the hell it is operates as a parallel automatic transmission, it’ll be cooled in the established way of a dedicated heat exchanger in the hydraulic system. ONLY thing remaining to cool would be the batteries, possibly the IGBT solid state inverter...I’m going out on a limb and assume the motor/generator portion is 3 phase AC
  17. Miscellaneous TTC Discussion & Questions

    C’mon. We know what he meant. its going to take several weeks, maybe a couple of months before the Markham road property is ready. They have to build a temporary bus access ramp between the employee parking lot and the west edge of the property...there’s about a 7’ grade difference. Expand the chain link security fencing to encircle the whole former dealership too. Right now the lot is about 1/3 outside its respective fence. Building Reno’s and upgrades will come later. Can be simply a secure parking area until then.
  18. TTC Orion VII Retirements

    Hehe. 4:20.
  19. GO Transit

    Duct outlet for cooling. Probably for the batteries, but that’s an educated guess.
  20. TTC in the news

    Only if there was some impedance from the running rails to ground. (broken, corroded cable or weld/ bonding of the rail for example)
  21. TTC in the news

    Sun news network....reporting stuff that made the frogs gay from 2011 to 2015. happy to see rebel media picking up the rainbow torch and fighting the good fight...making sure that homosexual frogs everywhere have at least..one ...voice in their corner .... 😪
  22. TTC in the news

    That’s a two way street.
  23. Exhaust regeneration disabled. -mostly for when running indoors, or anytime the exhaust outlet would be near anything combustible. Some operators will use it to stop a regen in progress, as sometimes unpleasant odours enter the cabin.
  24. TTC Orion VII Retirements

    Or, they simply don’t know who they’ll take it to yet.