Okay, so I made a train (which you can ride on it). I made the bogie (truck) and the suspensions were too bouncy
Unrelated : I actually used the roblox pre-built recording since it got updated. FInally no more waiting from the game bar recording 
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Try setting the Spring Stiffness to 4000 (if your using Springs)
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bro the main is so heavy and that stiffness couldn’t support the mass
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Try messing around with the stiffness levels or make the main brick massless
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do you have any idea about springs? making the main brick massless just makes the spring useless
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try reducing the mass or, as he said, increasing the stiffness. Also try messing with other properties on the springs relating to support. You might have to figure out ways to implement Hinge Constraints or something along those lines to assist the springs.