Car won't move without servos

I have a basic car chassis that I am using to create a cart ride game. Since carts travel on rails, I don’t need the cart to turn so I removed the servos. The chassis worked with the servos but as soon as I removed them it stopped working. Why is this?

With servos:

Without servos:

If the car’s movement script relies on the servos and you remove the servos, the script breaks and no longer functions at all.

There is no script though. It’s just the body and a vehicle seat

Without servos i believe it will disable the vehicle seat function, as you’ve realized. If you want the vehicle seat to function without servos then you will need to script its forward movement.

I am not entirely sure though.

Do you think you could help with my other open post? Car bounces around because of CylindricalConstraint - Help and Feedback / Building Support - DevForum | Roblox