Minecart storage system #2

Hello, here is another version I designed of a minecart storage system.
to let it work, you should place a minecart with chest at the places you see the minecarts on the picture. (the three right ones should move all the time)
then just press a button you like (be aware you never have more than 2 chests in front. otherwise there will be no parking place. and wait at least 3 seconds before pressing another button otherwise cats can collide)

I'm going to compare my first design with my second so you can choose wich you wanna download.

design #1
you exactly know what cart is coming to you

works like: every car has his own storage room, when you tell him to come, you can unload it and when you say it should go back you should say to what storage room and it will be stored at exactly the same place as it came from.

design #2
you can unload two carts at the same time
less buttons

works like: you tell a storage room to send its cart. the cart comes, if unload place #1 is occupied it goes to the second. when you say rail #1 or #2 should send its cart back, the car will be send to the first free spot. so it won't be stored always on the same spot.

Additional Notes

Please leave a comment and tell me what to improve ;)