Updated November 10 at 4:45 pm: Photos of the mockup have been added to this article.
This shows the mockup (actually three sections of the five-section vehicle) including street level (front door) and island level (at the second door with a ramp deployed) comparisons for boarding heights.
For more photos, scroll down to the bottom of the article.
Updated November 9 at 5:20 pm: In response to questions that have come up in this thread and previous articles about the new cars, I have added information at the end regarding the issues of weight-per-axle and the Toronto requirement that the cars negotiate single-point track switches.
The TTC will display a mockup of the new streetcar fleet for public viewing.
TTC Hillcrest Yard
November 12 to 15, 2011
10:00 am to 7:00 pm
Additional information about this event and the new cars is on the TTC’s LRV Page.
39 years ago, the TTC decided to retain its streetcar system, and this will be the second generation of new streetcars. Toronto joins the rest of the world with a modern car based on designs used in other major cities.
They’ve been a long time coming, and design changes have added almost a year to the process that TTC and LRT advocates expected when the order with Bombardier was approved. When I have details of the delivery schedule, I will update this post.
For additional hi-res views of the new cars, visit the “Meet Your New Ride” page. Something that’s immediately obvious is a family resemblance to the interior of the new Toronto Rocket subway cars.
Two observations about the TTC’s website:
- Comments about the improvement of capacity on routes and the approach to scheduling service are now out of sync with statements in the TTC’s budget papers. Originally, the TTC was committed to improving capacity on streetcar routes and keeping wait times reasonably short. Today, this position is no longer as definite because running service above a full standard load is transit gravy.
- The new cars will operate, according to the TTC, on new routes for the eastern waterfront. Considering the foot-dragging on this project, the cost escalation and the low priority given to waterfront transit generally, it’s hard to say whether these routes will ever actually be built.
Updates regarding technical issues with the cars follow the break below.
I exchanged emails with the TTC’s Stephen Lam, Chief Engineer, Rail Vehicle Engineering on some the technical subjects readers have raised about the new cars. The sections below are based on his responses.
Comparing weight-per-axle of LVLRVs with other cars
Yes, the weight-per-axle is greater on the new cars than those we now operate. The new cars, like the ALRVs, have three two-axle trucks, but these carry longer, heavier cars.
The axle load is higher on the new low floor cars than that on the ALRV because it is a longer car with higher capacity, air-conditioned, more auxiliary equipment, with structure and metal still built for 30-year life, but on the same number of axles. The axle loads on the CLRV and ALRV are almost identical because the ALRV is approximately 1.5 times longer than the CLRV, with 1.5 times more axles to carry the additional 50% weight.
What really matters, however, is the “unsprung load”, the portion of the total load that is not supported through some form of resilient suspension.
Vibration that could cause track and equipment degradation, however, is more caused by the mass below the suspension system – in other words, the weight on the wheel-axle set, or what is known as “unsprung” mass.
The new low floor vehicle still employs three layers of suspension – super-resilient wheels with soft rubber blocks between the wheel tyre and the axle; a rubber primary suspension system; and a coil spring secondary suspension system that supports the carbody.
More importantly, the “un-sprung” mass on wheel axle set of the new vehicle is lower than that on the current fleet of vehicles by approximately 10%.
Vibration and noise
Vibration problems with the roadbed arise from a number of sources, and this was described in detail in a research paper prepared in response to early problems with the CLRV fleet. The original “Bochum” wheels on those cars have a rubber layer to damp vibrations, but it is a completely different configuration from what existed on the PCC fleet and a similar arrangement with the super-resilient “SAB” wheels now used.
On the Bochum wheel, the axle hub is separated from the steel tire (the ring of metal that actually runs on the track) by a rubber ring. This ring is placed in compression by the force of the wheel on the track, and so the wheel is stiff in that direction. This aids in transmission of vibration to the trackbed. The concrete slab acted as a resonator.
When these wheels were introduced, Toronto was building non-resilient track with rails laid directly in concrete. By contrast, older tracks sat in asphalt or paving setts and the roadway would not vibrate.
The SAB (and PCC) wheels also have rubber between the hub and the tire, but in a vertical sandwich. On the PCC wheel, it is a single piece of rubber on each side while on the SAB wheel there are 16 separate “hockey pucks” (8 on each side of a wheel) providing a similar, but greater effect than the PCC design.
This puts the rubber in shear vertically, the direction the wheel bears on the track. It also changes the vibrating frequency to one that is high enough that solid pavement cannot resonate. Moreover, for many years the TTC has been building track that is mechanically isolated from the slab with a rubber sleeve so that any vibration from the wheels is damped out.
The new LFLRVs have skirts that cover much of the truck and block the transmission of noise from the wheels into the air.
Unlike the switches found on many LRT systems, the TTC’s streetcar network is built in the North American standard layout using single-point switches. This means that there is a movable blade only on the “inside” rail of a curve. By contrast, railways and the subway use double-point switches where both rails have a movable blade.
A single-point switch is cheaper to build and maintain, especially for street trackage, because there is no need to link the two blades so that they move as one unit. That’s why it was so common on streetcar systems. When a streetcar enters a switch that is in the curved or “open” position, the wheel on the inside of the curve (the right side of the car on a right turn) is pulled into the turn, and through the axle this directs the wheel on the outside into the correct track.
When the CLRVs operated with Bochum wheels, this arrangement caused derailments because the Bochum wheel, with its rubber ring, is not stiff horizontally. Rather than turning into a curve, the wheel would deform. Because the inner wheel was not pulling its mate on the other side of the car into the curve, the outer wheel would follow the straight track.
The SAB wheel is stiff horizontally and this pushes the inner wheel into the curve as desired with a corresponding move in the outer wheel.
One concern the TTC had with low floor car designs that used split axles (a separate half-axle for the wheel on each side of the car) is that there was no mechanism to transfer the force between inner and outer wheels at switches.
Truck design also affects how well a car will follow track on a curve, but that is independent of the type of switch used. The specification for the new cars improves on the CLRV truck in this regard.
Stephen Lam provided a set of illustrations of the design illustrating some of the points discussed here. Page 2 shows the design used for the Bochum wheel (left) and for the super-resilient wheel. Pages 3 and 4 show details of the suspension system. Page 5 shows the full truck (bogie) and skirting.
Photos of the Mockup added November 10, 2011:
This shows the second doorway of the car (also the second section) looking from the rear. The accessibility ramp is deployed at the high platform level. During the media briefing, we did not see it extended to its full length for pavement level access, but I was told that it is roughly three times longer for that type of situation.
The brick pattern in the window is a reflection from a nearby building. It is not part of the colour scheme.
This is the rear half of the second door panel showing the pushbuttons for opening the door (red) and requesting ramp deployment (blue). All doors on these cars are passenger activated.
This is a view toward the same set of doors from inside of the car. Note that the door panels are not all of the way open because they were set up manually for the tour.
Also visible here is a sample of the extra wide seat.
This is the view directly across the car from the second door. There are five flip-up seats in an area that can otherwise be used for wheelchairs and scooters. The lighter patches on the floor mark where spots for these devices and there are stop request buttons on the wall beside each of them.
The red box showing partly in frame (see enlarged version) on the left side is a placeholder for the ticket/Presto machine.
Looking out through the front door which is single width. TTC Chair Karen Stintz is in the background.
The main part of the operator’s cab. The video display in the middle will contain images from the cameras at each of the four door locations.
The left side of the operator’s cab showing the control handle for the car.
A poster explaining how fare collection will work. Both a generic ticket vending machine and Presto are shown.
The text in the poster says that the new scheme requires a system-wide conversion to time based transfers. This appears to set the stage for new transfer rules on the TTC.
A poster comparing vehicle capacity. The values shown are Service Planning averages, not the crush capacity of the vehicles. Also, the size of the new fleet is still shown as 204 despite budget moves to reduce or defer part of the order.
This map shows the deployment plan for streetcars on each route, and it is much different from the scheme laid out in last year’s budget papers. Bathurst, Harbourfront and Spadina are first up in 2014 with Queen following in 2015. This will allow the ALRVs to be retired in roughly 2016.