John, the track sections were assembled on the site where they were loaded - some disused sidings near the west of the city.
Here are some video clips of the action. (Video taken by my wife Irene).
First clip is the loading of the panels onto dollies and rolling across Brayford Road East level crossing.
http://www.youtube.com/watch?v=q4yXnOL55bU
Second clip is the panels passing through the station
http://www.youtube.com/watch?v=tfZ41jfgS04
Third clip is arrival at the work site
http://www.youtube.com/watch?v=0P9RixDqvcU