Diverting the existing A.P Express or A.P.S.K via VSKP from TPTY(in Future,hypothetically speaking) could be a bit taxing on the Passengers and yeah would be better if they travel via their existing routes while introducing a new train altogether from VSKP but i am of the opinion that if BZA ends up becoming the capital then be it A.P or A.P.S.K,they both would be run via VSKP so that the train travels atleast in A.P limits for some distance.