||Citybus Trolleybus Shows
Over Diesels In
Company Called It "Pollution
Consultant, John Blay, heads the trolleybus project team. Said
John Blay, "We completed the overhead track in early 2001; and
the trolleybus conversion in April 2001, and have continued to
test and improve it since then."
According to John
Blay, the trolleybus has so far shown to be better than diesel
buses in many areas. "The environmental aspect is the leading
advantage. In our trials, the trolleybus does not need engine
oil and filter changes, avoiding a lot of waste. It also
produces no exhaust gas, even when stationary with the
air-conditioning on, and is quieter than buses," said John
"The trolleybus also shows superior performance.
Even when fully loaded, the trolleybus accelerated more
quickly, and was better at hill climbing than an equivalent
diesel bus," John Blay said.
To enhance the power
efficiency of the trolleybus network, Citybus installed a
flywheel energy storage system, which preserves the electrical
power produced when the trolleybus is braking, and then
releases that power for the trolleybus to accelerate or climb
a hill, reducing the electricity needed by about 15 percent.
By contrast, diesel buses consume fuel, even when
stationary. "We downloaded computer data recorded on a Route
10 bus, running between Kennedy Town and North Point. The data
showed that during any operational day, the bus is stationery
for about 43 percent of the time. Though the bus is
stationary, the engine is still running, burning fuel and
producing exhaust pollution. In these circumstances, a
trolleybus is more environmentally-friendly," said John
John Blay also demonstrated how the trolleybus
can easily overtake vehicles blocking its way.
Citybus trolleybus is fitted with air-operated boom bases,
which enable the trolleybus driver to rewire at designated
points with rewiring troughs. "We envisage trolleybuses will
leave the service depots and travel to the trolleybus network
on the auxiliary power unit (diesel), and join the network at
these rewiring troughs," John Blay said.
In March 1999,
Citybus announced that it would embark on a HK$5 million trial
involving the conversion of a diesel bus into a trolleybus;
and building an overhead wire test track in Wong Chuk Hang.
The company wanted to offer an alternative,
environmentally-friendly mode of public transport. Citybus
decided on the conversion as local demand for bus services is
high and requires high capacity air-conditioned double-deck
buses, which are currently unavailable on the market.
All data gathered from this trial will be submitted to
the Transport Department for consideration.
believe that the trolleybus is workable for Hong Kong - and
would improve air quality in areas worst hit by pollution. The
trolleybus is one of the best solutions for reducing roadside
pollution caused by public transport," John Blay