1: /summon MinecartRideable ~ ~ ~
2: Ride in Minecart
3: /entitydata @e[type=MinecartRideable,r=1] {Motion:[1.0,0.0,0.0]}
You will end up at 0 0 0
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This is why they need to add the ability to use player selectors in a /entitydata command... because adding motion to the pig doesn't add it to the player.

As near as I can tell, ANY entitydata applied to ANY entity being ridden will teleport both riding and ridden below bedrock if not to 0 0 0.

Also experiencing this bug... same problem with boats too.