jizzah

When vanilla carts have been mixed with railcraft ones, e.g. 3 tank carts with a chest cart or 4 linked normal carts, they explode when they reach the 1st powered HS rail although it can happen later along the HS track. The cause seem to be the vanilla cart's linkage being sort of elastic as opposed to the fairly stable one that the railcraft ones have. This elasticity results in cart collision.

I found similar problems involving HS rails and minecarts. I solved it by only coupling railcraft carts together. Coupling vanilla carts and sending them down a HS line results in collision, but not railcraft ones.