I know this question sounds bizarre but believe me currently this question's answer is all that I care. So please if you have a relative working as railway employee, ask this question to him/her and post here. Please,please it's urgent.. Suppose if a blasphemy (BCM) machine is laying a geo grid of 3m width under track including deep screening work in down main line,(during mega block) then should there be any speed cap on trains passing through up line to ensure the safety of workers?? Is there any provision of it in railway/machine manual??? Given that the distance between up and down line is small, wouldn't high speed trains pose a threat? You know they might pull the workers toward them due to the vacuum created.