This race is the equivalent of the two leads, Dom (Vin Diesel) and Brian (Paul Walker), having a dick-measuring contest. After chasing down a bad guy, the pair have a quick drag race to see who can clear the train tracks before the approaching train hits them. Just for fun. Dom’s in his stripped-back muscle car and pretty boy Brian is in his flashy motor with all sorts of bells and whistles, because they’re different but also the same. And they make it across the line at the exact same time! Their dicks are precisely the same size! Hooray!