^ Maybe, but Virgin would have to get a waiver to run them on San Bernardino Line mixed with Metrolink's heavyweight rolling stock.
Most of the exceptions granted for lightweight equipment have assumed a sealed or closed system not connected to the national rail network, or time-separated.
I guess they might be more lenient with the waivers if PTC is already reducing the risk of collisions.
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la forme d'une ville change plus vite, hélas! que le coeur d'un mortel...
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