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With my (non-rail) civil-engineer hat on. The benefit of only having a single foundation for the gantry is that you dont have the problem of getting the distance exactly right between two foundations on either side of the track. Or, you have to make every gantry unique to span the varying distance across the tracks.
Or you have to put up separate single pylons for every track with all that extra digging and moving cables and drains out of the way
Also - foundations are expensive, but the extra steel work is relatively cheap. So while you may not save on cost overall, it may not be that much more expensive.
Just a guess.
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