scientific

Why are there double train tracks on railroad bridges? Hey there!  Recently, a question has been bugging me, I'm sure a lot of you have noticed this too, but the train tracks on a bridge are always doubled up, like this: Note the rails are doubled instead of single. So, my natural reaction was writing a blog post about it.. And here we are, talking about trains After some research, two possible answers came up, both are extremely interesting and.. I think both are true! The uses of guard rails (check rails): 1. Double tracks reinforce sleepers (railroad ties) and prevent them from moving in and out of place: Sleepers/ties are defined as rectangular supports placed under and perpendicular to the rails. sleepers function to transfer the weight of the train to the rockbed below and also to hold the rails in place and at the correct gauge. The middle stuff are the sleepers/ties That being said, the main rails hold the sle...