I operated an earlier version of this Plasma ?? was called the Electromatic, would grab the rails & move them plumb while a number of vibrating tools would push in under the sleepers to compact the ballast & correct the level.
Had a swing down trailer off the back & tethered self propelled buggy out front.
Both had sensor - camera's facing each other to determine alignment.
The Ballast Regulator would follow that up & behind that would be the Tamper, which had vibrating side wings & pads to compress the ballast on the outsides & in between the sleepers.