Its still ballasted in the conventional way, nothing different is done.
Bottom ballast, track in, top ballast, tamped, brushed (regulated, tidied up) and glued. Folk may have noticed that the fibre glass boards that were in the track during and after the storms are no longer there. These were all taken to Newton Abbot yard and may end up being used in Penzance but at the moment that's a big 'maybe'.