Double line - Considered as Up & Down. SWR has nothing to do inbetween MAO- MJO. During VSG-QLM Doubling, Only SWR will have lay lines till Outer (bothsides), Connection & Interlocking works will have to be done by KR.
Lots of freights run from/to VSG/LD along with KR Traffic, So Looks like Auto Signalling to reduce Sectional clearance wait, Quick dispatch & reduce delays.