There is a new Light Rail Transit line being built in Calgary called the West LRT. The section running from downtown to the second and third stations is elevated. See this animation WestLRT - Route Animation
The construction involves placing concrete towers which are joined with trusses, upon which the track and power lines will be placed. The launching truss moves from tower to tower as a sort of mobile crane to launch the trusses in place. It's a very large piece of machinery that has been very visible on the city skyline since the start of the project. I've been wanting to photograph it and this weekend was the time. It's due to be dismantled in April when its work is done.
North View
East View
Northeast View
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