ginge

stand on the end of a platform and wait for an express train to come thru, make sure you are wearing an orange hi-vis vest or jacket and then put both arms up in the air

this will signal the driver to stop in emergency fashion. and so will the following ways

Red flag held steady at shoulder height
Red light held steady at shoulder height
White light waved vigoursly (at night)
both arms raised in the air




now be sensible