fast train homepage › Forums › fast train › fast train This topic has 0 replies, 1 voice, and was last updated 2 years, 8 months ago by Ellen. Viewing 1 post (of 1 total) Author Posts March 30, 2021 at 2:49 am #3834 Score: 0 EllenParticipant 1) You will need a train that moves with the speed of sound. 2) The light emitted from the source can interact (scatter) with the air molecules. So you will have to make the train vacuum. Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In