They won't allow trains to arrive before time as there is common line for both HWH and Chennai bound trains for 8 km from gopalpatnam to Vskp station. Vskp is enough of platforms. There are 3-4 trains ahead of it which have to arrive at 1940-2000. Janmabhoomi arrives at 2000 most of days as SBC Guwahati slot of trains arrive in PF 1 and depart at 1935/40 which is dinner stop. When a train leaves from PF 1 the entry to other PF is restricted.