Trolleybus fact and fiction
From time to time there has been concern that the electric trolleybus system operated in Vancouver would be abandoned. These concerns recently reached a new high when over-enthusiasm for the Ballard fuel cell bus led to a pervasive perception that the trolley system would soon be on its way out. The situation has since calmed down considerably, with TransLink deciding to purchase new trolleys over the next few years. Nevertheless, the long-term future of the trolley system remains a concern as there remains opposition to the trolleybus from some quarters. In order to help inform the public, we provide the following information to help maintain constructive dialogue.
First, we present the following myths:
- There has been no significant investment in the system recently
- Other technologies can provide all the benefits of trolleybuses without the wires
- Compressed natural gas buses are cleaner than trolleybuses
- No one makes trolleybuses any more
- Trolleybus systems are generally being abandoned
- Trolleybuses are really expensive to operate
- Trolleybuses can’t be accessible to wheelchairs
This article presents facts countering these myths. Other relevant articles include those on:
- Current Vancouver trolleybus operations
- Vancouver City Council resolutions on trolleybuses
- Electric Vehicle Technologies
- Energy efficiency
- Electric Trolleybus Manufacturers and Orders
- Trolleybus essay – history, characteristics, local issues
- Vancouver transit
- Vancouver trolleybus network
- BC Transit Vancouver operating statistics
Trolley opponents would like us to believe that no investment has been made recently in the trolleybus system, and thus when the current fleet is life-expired in 2003, it would not be a waste to shut the entire system down.
The facts, however, tell a different story. The trolley overhead in Vancouver is in generally good shape and is being actively maintained. The system was extended in September 1988 by 3.1km to UBC at a cost of $1.5 million. The system has also recently been extended to Metrotown at a cost of $1.4 million. The wood poles on Powell street have been replaced at a cost of $700 000. New trolley overhead maintenance trucks have been purchased at a cost of $800 000.
It has been estimated that the total system is worth $100 million. In addition, the 12 original rectifier stations (electrical substations that convert higher voltage AC to the 600V DC used by the trolleybuses) were all replaced by 1994 at a cost of $15 million.
Technology will provide a better solution?
Much attention has recently gone to the Ballard fuel cell bus. This bus uses a hydrogen fuel cell to produce electricity which is then used to power electric motors. Such a bus potentially has the advantages of electric traction (small, efficient motors, quiet, quick acceleration, ability to recover energy when slowing) but the disadvantage of carrying a fuel source and “fuel source converter”. In fact, the Ballard fuel cell bus necessarily contains all the components of a trolleybus except for trolley poles. Thus, claims that the Ballard bus will be cheaper than a trolleybus do not make sense. Other hybrid technologies using electric traction have the same problem – they are all essentially trolleybuses carrying their own power source.
The economics of hydrogen as a fuel, at present, make the fuel cell bus impractical. According to Bus World, a “fill-up” for the Ballard bus costs US$250 vs. US$72 for a diesel bus.
So then, is the Ballard bus worth pursuing? Certainly! Assuming the price of hydrogen relative to diesel changes, the Ballard bus can provide quiet, zero emission (well, zero nasty-compound emission) service using a renewable energy source on routes which do not justify the cost of providing trolley overhead. In other words, it is a possible replacement for internal combustion engine powered buses, not trolleybuses.
Natural gas powered buses are “clean air buses”, aren’t they?
Compressed natural gas (CNG) buses have been touted as “clean air buses”, implying “zero emission”. This is just plain false. CNG buses produce all the pollutants diesel buses produce, just at substantially lower levels. Recent “clean diesel” engines, however, have closed the gap significantly. Pollutants specific to CNG engines are only just being researched. In any event, CNG buses produce carbon dioxide, which is known to cause global warming.
So, then, what about the comparison between trolleybuses powered by a natural gas fired power plant (e.g. Burrard Thermal) and CNG buses? Well,
- the power plant can be made twice as efficient as an internal combustion engine (currently they are approximately the same efficiency)
- the power plant produces emissions away from urban areas, and can decrease its emissions during times of high pollution levels
- the trolleybuses aren’t powered just by Burrard Thermal anyway! Burrard Thermal provides 7.5% of the province’s power – almost all the rest is hydroelectric (zero emission!).
Trolleybuses powered by hydroelectric power produce no air pollution – CNG buses do. CNG buses are as noisy as diesel buses and do not accelerate up hills as well as trolleybuses. CNG buses are not a replacement for trolleybuses.
No one makes trolley buses any more, do they?
The following manufacturers are currently building trolleybuses to fulfill outstanding orders: AGT, Breda, New Flyer Industries, Graf & Stift, Hess, Ikarus, Jelcz, Kapena, Kyiv, LAZ, Mafersa, MAN, MASA, Menarini, Mercedes-Benz, Mitsubishi, Moyada, Hess, Neoplan, Novabus/Kaman, Osaka Sharyo, Rocar (DAC), Samara Transport, Socimi, Solaris, Severny Troleybus, Skoda, Van Hool, Volvo, YuMZ, ZIU.
Isn’t everyone getting rid of their trolleybus systems?
While it is true that some North American systems have recently been abandoned (e.g. Hamilton, Toronto), there are still hundreds of trolleybus systems in operation world-wide, and new ones being built. For example, an 11.2 km long trolleybus line has recently been constructed in Quito, Ecuador as a rapid transit system with 22 stations and high level platforms. The line uses 54 articulated trolleybuses.
This list of orders for trolleybuses and dual mode trolleybuses (trolleybuses with off-wire capability) since 1990 should dispel the myth that trolleybus systems are being abandoned everywhere. The list shows that over 100 systems have ordered a total of over 2,600 trolleybuses over the last decade.
What about cost?
Surveys done in Vancouver and Seattle show the cost of operating trolleybuses to be slightly higher than that of diesel buses. The cost of trolleybus operation includes the cost of maintaining the trolleybus network and the higher initial cost of the trolleybuses, which is offset by the much lower energy cost (trolley buses use less than half the energy that diesel buses do to go the same distance). A couple of notes are in order, however:
- The Vancouver study unfairly compares trolleybuses in stop and go traffic to diesel buses which include many highway express routes.
- Trolleybuses could actually be cheaper – the Vancouver study shows the cost per vehicle kilometre of electricity and overhead line maintenance to be less than the cost of diesel fuel – except for the high maintenance costs which seem at least partly related to the particular model in use in Vancouver
- The cost of diesel fuel is low at present, but cannot remain so indefinitely – it is, after all, a non-renewable resource. As well, the cost can be made higher very quickly – viz. the 1973 Arab oil embargo.
In 1993 a BC Transit report estimated the cost of a brand new trolleybus to be 1.5 times that of a diesel bus, but the trolleybus was expected to last 30 years and the diesel bus 20, so helping to balance the additional cost. The previous fleet of Brill trolleybuses did last over 30 years. The current Vancouver fleet is now to replaced when the vehicles are about 20 years of age, although a desire to provide accessible transit service could be seen as a secondary motivation for replacement.
So why do trolleybuses cost more? The answer likely lies in the economies of mass production. Clearly there is a much larger market for diesel engines, since they are used in trucks and buses throughout the world. The huge population of diesel engines has resulted in very competitive manufacturing and maintenance industries. The market for transit buses as a portion of this entire market is relatively small, and the market for trolleybuses is even smaller. An obsession with incorporating the latest high-tech electronic components on new trolleybuses also serves to drive up costs and ensure “teething troubles” when new models are introduced.
TransLink’s board of directors decided on June 21, 2000 that new, low-floor trolleybuses would be purchased as follows:
|Replacement of existing 244 12m (40-foot) trolleys||205 12m rigid trolleys, and either
60 12m rigid trolleys or 40 18m articulated trolleys
|Fleet expansion option to meet requirements to 2006||Either 60 12m rigid trolleys or 40 18m articulated trolleys (option to be decided in 2004)|
A new TransLink Board of Directors was appointed in January 2002. The new Chair, Doug McCallum, Mayor of Surrey, made the following comments at a January 17 conference:
“The first thing we are going to look at is how we can get fuel cell buses in this region because the technology, the world technology, is in our region and we should be using it. Electric power, is another clean energy source and we need to find out how we can put more electric buses in our system.”
Be sure to visit the Vancouver Trolleybus web site for more details on the benefits of trolleys and why they must be retained.