63Re: [carfree_cities] Ranking US cities
- Apr 10, 2000
>> >Are the trolley buses you have in mind electric buses attached to power andIn the case of trolleys, there's one overhead "hot" conductor. The
>> >ground lines?
>> There are positive and negative wires, but there is no ground that I know
rails serve as the return path (at ground potential, of course).
>Negative would do it. Path for the current. I was trying to get a fix on how itYes, two conductors are always required, and the amount of
>worked. The trolleys could be grounded to the metal rails, but an electric bus on
>rubber tires would have to be worked another way.
hardware that has to be installed up in the air is quite
considerable. Also, it is quite common for one (or both!)
trolley poles to come off the wire, which results in a
delay while the driver tries to get the pole back on the
wire. This sometimes takes a fair bit of time.
>I find the use of trolley buses attractive because it would be relatively cheap toOn the other hand, the cost for the overhead wires is more
>string the cables, the road is already there.
than double that for a trolley because of the complication
of wires having to cross where routes join and diverge.
>Several varieties of electric motor have already been put into service. TheAs far as I am aware, no in-service system has used storage
>problem is storage of power, but if that came off a line, problem solved.
(there are some tests with flywheels and batteries, I belive).
Fuel cells would solve most of the problem, and some fuel-cell
buses are under test.
>Parts and repair for trolley buses would be available nearly everywhere. If oneThese buses are highly reliable. The main components are
>needed major repair, it could be taken offline and towed.
so long-lived that they are often set under a new coach
body after 20 or so years.
>I am ready to be corrected in this, the bikers in the group may jump allMy philosophy is this:
>over me for this, but it seems that a lane devoted to the exclusive use of bicycles
>and trolley buses might be helpful. If the lane serviced nothing but bikes and
>regular predictable buses, it would be a lot safer than sharing the road with
Allocate space first to public transport (a la Zurich), so
there are never any traffic-related delals.
Make sure bikes get their own space (the speed differentials
mean that the two kinds of traffic do not mix well).
What's left over can go to the cars.
J.H. Crawford _Carfree Cities_
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