Septa track question

I have noticed that the Septa tracks near my house have screws on them, like SAM track. Seeing as screws are mostly found on bridges only in the US, why did they use them on this track? Does it have anything to do with the fact that Septa only runs lighter EMU's, as compared to heavy trains?
 
The Pandol Railroad Track Clip, and various other similar variations, are used worldwide. Europe has has screws instead of spikes for many, many decades. This allows the replacement of rails much faster, as spiked track often needs the entire ties and all the components to be replaced when rail is changed. Or tie hole spike plugs with epoxy are used to fill the RR track spike holes. Even in WW2 Eropean railways had screws instead of spikes ... See the movie, staring Burt Lancaster: The Train: (link comming)
 
I think this is going to become the standard worldwide as far as commuter railroads go. Our MBTA has been using them for years now on their trolley and subway tracks, and I saw this recently on the newly replaced track on the Haverhill line.

John
 
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