Different types of minecarts with differing speeds

Rails are one of my favorite aspects of the game, so with this new rail speed Gamerule, I’ve been thinking about them a lot while I build rails on my server. As many have pointed out, changing the gamerule can break a lot of contraptions on servers, which would be a shame. My suggestion is to have different types of minecarts that move at different speeds, so that the regular minecart doesn’t break any contraptions, but the usefulness of minecarts as transportation still gets the update. I’m not sure “gold minecart” or “iron minecart” or “diamond minecart” is necessarily the coolest thing ever, but the idea is multiple tiers that all move progressively faster. Alternatively, they could have a GUI like a horse or donkey, where you could drop in different amounts of fuel to make them faster. I prefer updating the minecart over adding more kinds of rails, because then making long tracks gets even more expensive, which is self defeating. Rails are SO much fun, and I love that they are getting attention which has made me think about this again.