dowlingm
Senior Member
4505 in service on 512
Almost done, but not quite. I saw a 504 CLRV on Broadview yesterday. Looking at Nextbus right now, it's reporting car 4199 (along with 36 Flexities) is out on 504 currently. Looks like it arrived in Russell Yard a few minutes ago - but Transee shows it was out on 504B for PM rush leaving Russell at about 3:30 today. https://www.transsee.ca/triplist?a=ttc&fleet=4199504 is done with the Flexity conversion, which means the 501 Monday-Saturday conversion for Flexities will soon begin, which will signal the end of the ALRV'S
Holy cow, how long does it take to get some of these things on the 505 and 506? Some people need accessibility.
504 is done with the Flexity conversion, which means the 501 Monday-Saturday conversion for Flexities will soon begin, which will signal the end of the ALRV'S
I'd expect them to hold off starting any on 501 until they've got a few more spares.
506 most likely wont see a flexity until the end of 2019.
If not, you can expect Bombardier to be offering us some free extra Flexities as compensation for missing their deadline.
Yeah...I get the distinct feeling that problem is far worse than being let on. There's really awful groaning coming from the region of the trucks, and when doing a sudden braking, the body shifts dramatically on the trucks, to the point that each bogie *appears* to be acting independently of what should be a synchronous application of brakes. The problem for passengers manifests in them being thrown around, even with small brake applications.Don't forget they need to rotate out 67 of the delivered vehicles, and send them to Quebec for that welding problem.
Yeah...I get the distinct feeling that problem is far worse than being let on. There's really awful groaning coming from the region of the trucks, and when doing a sudden braking, the body shifts dramatically on the trucks, to the point that each bogie *appears* to be acting independently of what should be a synchronous application of brakes. The problem for passengers manifests in them being thrown around, even with small brake applications.
They not only 'grab' they do so as part of a 'sense and correct' loop (negative feedback servo) that is responding inequitably for each bogie. Something's very wrong...
I was under the impression that the sudden braking body shift was from a track brake
https://en.wikipedia.org/wiki/Track_brake
The CLRV/ALRV's have track brakes, so I assumed the Flexities do too.
I thought the shifting was from an unequal force of track brakes "lifting" the car a bit.
"Squatting" is exactly the sensation. It is probably a combination of a multiplicity of 'sense and correct' loops being complicated and disjointed by a loose mechanical coupling. It *feels* like it's putting enormous stress on the frame members (I desist from saying 'chassis' as I doubt there is one per-se in entirety).The track brake is exactly what is causing those sensations.
It should be noted, that the brake system on the Flexities is a pretty complex beast. Rather than the positions of the brake handle actually causing a specific amount of brake force to be applied, the position of the brake handle will cause the streetcar to calculate a stopping point - regardless of the conditions or grade - and apply as much (or little) force as necessary to stop at that point.
As for the "lifting", that is due to each truck, having a limited amount of rotation, "squatting" under braking forces and causing a torsional force on the carbody - much in the same way as the front of a car will "dive" under hard braking. It's a much more complex sensation in the Flexities however, as the only vertical hinge is the one between the third and fourth modules.
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Dan
Toronto, Ont.