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Thus there is little or no savings in term of time or money compared to light rail. The big cost is the exclusive right of ways, the key to a successful light rail system AND THE KEY TO THE CURITIBA BUS SYSTEM.
I like mentioning the last two trolley lines in Pittsburgh, the county seat of Allegheny County Pennsylvania. When the local transit authority took over the old trolley service, it proceeded to close down ALL the old trolley lines except the one to Beechview section of Pittsburgh and the other line that went to Upper St.Clair Township AND Bethel Park Township (The route actually split halfway to either township).
The plan to replace the Bethel Park Streetcar had a huge hurdle to over come. The Highway the streetcar ran by (on its own right of way) could barely handle the automobile traffic, throwing buses on it would make it even more of a traffic mess (And the Streetcar, since it was on its own right of way was FASTER then going by car from Bethel Park to Downtown Pittsburgh even with the high number of stops the streetcar made). Plans to widen the highway faces three problems, first the highway went through a heavy populated urban area, thus the cost to take over the land to expand the highway was high, Second, the highway went through a valley with steep walls and other narrow areas throughout its length, another huge costs, third, the highway went through the heart of the old Pittsburgh Coal Seam, which meant the whole area has been undermined, often in the 1800s. The mines are a problem when it comes to support for the highway AND no accurate maps exist of most of the mines around or under the highway. The cost to make sure the new highway has adequate support UNDERNEATH would make acquisition of nearby lands for the highway look cheap. Thus expansion of the Highway is talked about, but not seriously.
As to the Beechview line, It had its own tunnel (Which it shared with the Bethel Park Line) into downtown Pittsburgh. In Pittsburgh itself these lines were on public streets, but once outside downtown Pittsburgh into the trolley tunnel they went, bypassing a huge level of traffic. The Bethel Park line (Called the Library line) diverged from the Beechview line once on the other end of the trolley tunnel (Now called a "Transit Tunnel", for it was paved for bus use in the 1970s). The Beechview line went on its own right of way, across PA 51 (The main road in that part of Allegheny County) and along US 19 (The main highway by the Beechview line). It then entered Beechview where it went on its own right of way till the 1940s, when it was paved and merged with the parallel streets to become "Broadway Avenue" in the Beechview section of Pittsburgh. Broadway is unique, it is a wide road, with the streetcar tracks in the middle, but it starts where the streetcars get off its own right of way, and ends where the Streetcar goes back on its own right of way. Fir its width, Broadway is a low traffic road (More do to the fact very narrow roads are the only way from it to the local highway.
Attempts to replace both lines kept coming across the problem that buses, do to the fact they had to go on over used local highways, would take 2-3 times as long as the existing Streetcar lines (and I will NOT mentioned the cost to upgrade those highways just to handle the buses needed). The time saving was do to the fact both lines were on their own right of way for most of their length (The Library and St Clair Lines completely on their own right of ways, only the Beechview line went on public roads).
Thus these two Trolley line survived the close down of all of the other Streetcar lines, do to the fact they were on their own right of way which permitted them to be as fast as automobiles. In the 1980s these two lines were upgraded to light rail status, do to the fact all other options provided less service (Including using an automated system, called "Skybus", which was to use the people movers found at many large airports today as a replacement for the streetcars).
Curitiba's bus system follows the same rule as the above Pittsburgh Streetcar system, exclusive right of ways on which only one type of vehicle operates, a vehicle incapable of operating anyplace else (The Streetcars can only go where streetcar tracks are, the huge buses in Curitiba can only be used on the exclusive right of ways set up for their use).
Thus the key to Curitiba's success with buses, it to put them on their own right of way, something that can be done better with electric Light rail, given that such Electric Light Rail can be operated with minimum ventilation do to the fact Electric light rail do NOT produce excessive fumes, like buses.
Side Note: the 270 number given for the buses in Curitiba, is for "Crush Loads" i.e. people standing as close together as possible to get the most people on the Bus. Light rail have even higher "Crush Load" capability, but most people prefer to have a seat, and thus we should compare Seat to seat numbers NOT Crush numbers for Curitiba's buses with the seat numbers for Light Rail.
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