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| NJT artic bidders (331811) | |
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| (331816) | |
Re: NJT artic bidders |
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Posted by r33/r36 mainline on Tue Nov 13 22:21:19 2018, in response to NJT artic bidders, posted by kcram3500 on Tue Nov 13 12:29:04 2018. I hope New Flyer or Nova wins this order.. seeing a Suburban XD60 or LSFA would be pretty cool. |
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| (331817) | |
Re: NJT artic bidders |
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Posted by NJT Oradell on Wed Nov 14 12:44:22 2018, in response to NJT artic bidders, posted by kcram3500 on Tue Nov 13 12:29:04 2018. Given the rider complaints that were endured with the Volvos as well as the foul weather handling issues I'd be quite surprised if NJT bought tractor type artics again. I think New Flyer will likely get the order, but that's just my feeling. |
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| (331818) | |
Re: NJT artic bidders |
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Posted by Joe on Wed Nov 14 13:00:44 2018, in response to Re: NJT artic bidders, posted by NJT Oradell on Wed Nov 14 12:44:22 2018. Which are the driving wheels on an articulated bus? NJT Oradell wrote of tractor type artics.--- In The Bronx about three years ago, artics had problems on White Plains Road near Parkchester, the rear end swinging around. I don't know which wheels drive on that equipment either. Thanks for any explanation. Joe |
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| (331819) | |
Re: NJT artic bidders |
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Posted by kcram3500 on Wed Nov 14 13:28:05 2018, in response to Re: NJT artic bidders, posted by Joe on Wed Nov 14 13:00:44 2018. In a tractor artic, the engine is in the center of the front body and drives the center axle. The rear axle countersteers based on the joint's rotating action.In a pusher artic, the engine is mounted in the very rear like a standard bus, and drives the rear axle. The center axle is a "dead" axle that only provides weight support and braking. NJT had Volvo tractor artics from 1985 until 2004, and Neoplan pushers since then. MTA has only used pushers from New Flyer and Nova. |
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| (331820) | |
Re: NJT artic bidders |
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Posted by MorningsideHeightsM100 on Thu Nov 15 09:20:13 2018, in response to Re: NJT artic bidders, posted by kcram3500 on Wed Nov 14 13:28:05 2018. What are the pros and cons of each type? |
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| (331821) | |
Re: NJT artic bidders |
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Posted by kcram3500 on Thu Nov 15 10:36:43 2018, in response to Re: NJT artic bidders, posted by MorningsideHeightsM100 on Thu Nov 15 09:20:13 2018. For a tractor, the main benefit is improved turning radius since the rear axle countersteers the front axle. NJT's Volvos could turn on a dime. While no longer available, a standard-floor (two-step entry) tractor artic had the entire length of the bus available to driver and passenger seating... NJT's Volvos had 65 seats in the 3-door transit version and 67 seats in the 2-door suburban version. The cons are, the rear body is much lighter and can loses traction more easily in slippery conditions. The steered rear axle also causes the tail to swing outward during full turns, which the driver must be conscious of in tight situations. Maintenance is also more difficult with the unusual location of the engine and transmission.For a pusher artic, the pros are parts and design commonality with the standard bus it was made from, which makes maintenance training and repairs easier. The heavier rear end is less likely to lose traction than a tractor artic, but certainly not impossible. The cons are a loss of maneuverability with the fixed rear axle (doesn't countersteer) resulting in a wider turning radius compared to a tractor of the same body length, and depending on how the powertrain is designed, there may be a loss of seating if the passenger compartment is unable to reach the rear of the body. |
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| (331822) | |
Re: NJT artic bidders |
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Posted by mack c-49 on Thu Nov 15 19:42:35 2018, in response to Re: NJT artic bidders, posted by kcram3500 on Thu Nov 15 10:36:43 2018. With the pushers isn't there also an increased possibility of jack-knifing in icy conditions? With the power coming from the rear, it would seem that a lot of stress would be placed on the swivel joint which might destabilize the center of the bus in certain conditions. |
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| (331823) | |
Re: NJT artic bidders |
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Posted by mack c-49 on Thu Nov 15 19:50:31 2018, in response to Re: NJT artic bidders, posted by kcram3500 on Thu Nov 15 10:36:43 2018. With the pushers isn't there also an increased possibility of jack-knifing in icy conditions? With the power coming from the rear, it would seem that a lot of stress would be placed on the swivel joint which might destabilize the center of the bus in certain conditions. |
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| (331824) | |
Re: NJT artic bidders |
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Posted by kcram3500 on Thu Nov 15 20:39:59 2018, in response to Re: NJT artic bidders, posted by mack c-49 on Thu Nov 15 19:42:35 2018. The joint in articulated buses has limiters designed to prevent that, regardless of which end the power is coming from... unlike a tractor-trailer truck's fifth-wheel coupler which can rotate a full 360° if conditions allow. |
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| (331839) | |
Re: NJT artic bidders |
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Posted by mack c-49 on Fri Nov 16 19:31:54 2018, in response to Re: NJT artic bidders, posted by kcram3500 on Thu Nov 15 20:39:59 2018. See the thread above about jack-knifed buses and operating artics in snow conditions. I have a picture of several Ottawa Transpo buses disabled at an intersection as a result of a snowfall. The buses were all stranded at awkward angles. I'd post the picture if I knew how to post pictures at this site |
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| (331840) | |
Re: NJT artic bidders |
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Posted by TransitChuckG on Fri Nov 16 20:09:18 2018, in response to Re: NJT artic bidders, posted by kcram3500 on Thu Nov 15 20:39:59 2018. unlike a tractor-trailer truck's fifth-wheel coupler which can rotate a full 360° if conditions allow.That's because the king-pin on the semi-trailer is round. 360 degrees would never happen if the rig jackknifed, I'd say around 300 degrees at the most. |
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