There are three types of tracks:
Rails
Powered Rails
Detector Rails
A cart will only be placed if you are looking at a type of rail.
After you place it, you can push it around on the grass or sand
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You could push the minecart, although you wont go that far. You can also try powered rails to push your minecart forward.
Right. Booster rails need redstone power... But theirs an easier way! Step 1: Get a pig to enter the minecart Step 2: Craft and place a sadle on the pig in the minecart Step 3 : push minecart gently and get on pig Step 4: Have fun and try not to over excite the pig from behind! >.<
You cant go to Olympus but you can go to the nether.
go to options, and force update. this will restore your minecraft jar and make it run again.
Go to minecraft wiki and do a search for "mob grinder" and it gives you a tutorial of how to do it.