Accelerating and deccelerating using CFrame and tween service

[iiLok_i (ItzLokiHere)]

Hey devs! I am trying to make a drivable train and I’ve ran into some problems.

Basically I want to use CFrame to make the train run smoothly and not derail. While this works really good, I want it to make it that you decide how fast and how slow it goes. Any tips on that? With CFrame and TweenService you can only decide how fast it goes by the time you want it to finish.

How do I make my minecart stay on the rails?

I have a Minecart in my game, and looked at a bunch of approaches while working on my project. Don’t: Physically model the Minecart based on real-world mechanisms: Real-world mechanisms work because of real-world laws of physics. When you model mechanisms based on their real-world counterparts, you run the risk of it breaking down when those laws aren’t the same in Roblox. You also take on all limitations of the real-world mechanism e.g. cart will derail if moving too fast / may derail if mas…

I’ve tried looking for calculating the time with speed but it doesn’t help as I can’t really slow down then.

Thanks for reading this.

[Ie_fishe (paywalls)]

Have you tried using physics to move the train rather than using position methods?

[iiLok_i (ItzLokiHere)]

Yeah, but it can derail really fast and I know it is more realistic, but I’m just seeing if this option is available.

[36magic]

You can make the speed of the train be a value, and then, via a script that uses services as UserInputService to detect when the keys W/S are triggered, then with a remoteevent, make the speed in the value raise or reduce while the keys are pressed.