"Ballast" (a type of gravel) is used in railways to give stability to the tracks. The more stable the tracks are, the fastest a train can go, so why not applying this mechanic on Minecraft? And also gravel would win a new functionality.
This post is also on reddit: https://www.reddit.com/r/minecraftsuggestions/comments/czljdy/minecart_speed_increases_when_gravel_is_put_under/
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