As you can see in the following picture, once minecarts are spawned stacked on each other they glitch trough the rail. This bug wasn't in the game before the snapshots.
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For that one I used this:
/summon MinecartRideable ~ ~10 ~ {CustomDisplayTile:1,DisplayTile:159,DisplayData:4,DisplayOffset:100,Riding:{id:MinecartRideable,CustomDisplayTile:1,DisplayTile:159,DisplayData:4,DisplayOffset:116,Riding:{id:MinecartRideable,CustomDisplayTile:1,DisplayTile:159,DisplayData:4,DisplayOffset:132,Riding:{id:MinecartRideable,CustomDisplayTile:1,DisplayTile:159,DisplayData:4,DisplayOffset:148,Riding:{id:MinecartRideable,CustomDisplayTile:1,DisplayTile:159,DisplayData:4,DisplayOffset:164}}}}}
It's definately gone in 14w17a!
Possibly already earlier, but probably just by 14w17a because of Mojang switching back to old minecart physics
What is the exact command(s) you used?