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[quote user="Overmod"]ow hold on a moment, read up on the idea before invoking Lyle: <a>http://www.trensquebec.qc.ca/english[/quote]</a> Sounds very optimistic and ambitious. The suspended monorail systems on rubber tires I know of have a maximum speed of 50 mph (80 kph). But 155 mph (250 kph) on these tires? I have my doubts. Light system is relative. When I was project manager (structural design) on the rebuilding site of the burned down Duesseldorf Airport we had to implement the columns of the Siemens Sipem people mover into our construction:  <a href="https://ic.pics.livejournal.com/barmashev/70799644/66973/66973_600.jpg">https://ic.pics.livejournal.com/barmashev/70799644/66973/66973_600.jpg</a> IIRC the monorail weighed around 0.7 kips/ft at 30 mph (50 kph) and 100 ft (30 m) span. That is about the lane load in US and Canadian bridge design codes. Not to mention the weight of columns and their fixing moments. In my opinion there is no way to use a Highway bridge without loosing a traffic lane. With 131 ft (40 m) span and 155 mph (250 kph) the monorail's weight will possibly more than double. I think the shown open H-section as monorail is less than ideal in curves at high speed. It would be interesting to learn what the cost estimate was based on. Without further information it is not more than an eye catcher for me.
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