MinecartCollisionEvent is fired whenever a minecart collides with an entity.

You will need to cast the event in the function header as this class:
crafttweaker.event.MinecartCollisionEvent
You can, of course, also import the class before and use that name then.

MinecartCollision Events implement the following interfaces and are able to call all of their methods/getters/setters as well:

• IMinecartEvent

ZenGetter	Type
ZenGetter collider	Type IEntity