Quote fromQuote fromWow, it takes a LOT of gold for working minecarts
It actually takes just 5
In this order in 3x3 grid:
  
Ummm, read the thread ok. It's not about how to actually make a minecart. But thanks for the thought I guess.
Watch all the videos. There are like half a dozen. They show you exactly how to make a booster to put at the start of a track to get more than enough power to save you from making gold tracks every 16 blocks.
If all you are going to do it read the title and not the entire thread you aren't going to know what is going on.
Watch all 8 of the videos
Watch all of them. There is one that shows how to do the exact same thing as this one except for with water instead of all those repeaters.