It’s totally offline. Would unreal/steam still need multiplayer functionality? Hell, Ive only got like 5 friends xD. I don’t think I could even summon 20 people online 
At the moment what I’m doing is, Is positioning the camera when the race begins in a specific way, and then having the player progress bar at the bottom with the players Icon being a drawn widget or something(I havent planned how to make the player stand out yet),
then firing the Emitter with 10 to 50000 particles. Ive slightly offset them to make them stand out and then having the start and stop points go across the screen inline with the progress bar.
Thinking about it as well. I could probably change the camera at the start to orthographic so It sits flat instead.
I can fire this 50k emitter off a bunch of times in a row, and it doesn’t seem to make my pc explode, so thats good.
I wonder if I can get the information from each particle and then the float value of distance covered, I can relate that too the players float to show the real time position in the pack.