Let me remind you if you have forgotted in case, That in one run MUV SF also did this like run when rajdhani, sg etc crawled off and MUV SF maintained the same delay what it started of from MUV and same at NDLS. Its all because of its day run that day in which fog was not there and it got precedence on everyone enroute, similar the case it is. Getting precedence in FOG is not easy but in clear weather it is possible.