You keep some flexibility at significantly less cost that the electric token block currently there. But I had wrongly assumed it was vintage signalling beyond the electrified line, but after searching it’s actually centrally controlled modern signalling to Girvan .
It's currently vintage signalling beyond Dalrymple Junction:
Dalrymple - Kilkerren - Girvan is (tokenless?) block.
South of Girvan is electric tablet block with boxes/instruments and loops at Girvan, Barrhill, Glenwhilly and Dunragit.
NR's preferred option is to modernise north of and rationalise south of Girvan.