only way to run GZB WAP4 end to end journey is bypassing VSKP. else almost impossible.because any train going via VSKP has to have rake reversal. e.g. HWH-MAS MAIL(HWH-VSKP SRC WAP4) & VSKP-MAS (RPM/ED WAP4)...rarely it will go end to end journey with GZB WAP4 via VSKP is just an offlink....