Over several months sections of bridge appeared on the ground. They were made in Padua, Italy and shipped to Haifa port. Then at midnight one night the traffic was blocked and with great fanfare the sections were lifted over the road onto temporary supports.
Spanish architect and engineer Santiago Calatrava had to work with many constraints, one of which you can see below. The bridge has to curve in order to get between the existing buildings.
And if you click and enlarge this photo you can see the man covering the bridge's eastern embankment with compulsory Jerusalem stone. (Since the early 20th century the law requires every building in the city to be built of, or at least faced with, Jerusalem stone.)
To quote an excellent article, "To Draw A Bridge" (see it here)--
"Calatrava . . . began by considering the constraints of the situation in Jerusalem: a tram line that needed to cut an S-shaped path from Jaffa Road to Theodor Herzl Boulevard, rising above a dense intersection and clearing the way for a public plaza beneath. The city engineer wanted to make life easier for pedestrians and also give some much needed character and panache to a congested urban entanglement through which much of the traffic arriving into the city passes. Building in Jerusalem means using Jerusalem stone, and Calatrava knew that he would need to balance the sturdy honey-colored rock with more modern touches of fluid steel and glass. He wanted to create something that would seem to fly -- its span soaring over the tops of the cars -- and hoped the structure would serve the city as a gate and not another wall."
Recently the tall mast was raised and the cables attached. But the bridge is still not suspended. Much work remains to be done. And the rails for the tram are nowhere near completed.
Calatrava was inspired to create something resembling the harp which David played while singing his psalms. The Bridge of Strings will be the first train-carrying curved suspension bridge in the world. As with everything in the Middle East, we just need patience.