It's similar but it doesn't include the issue that the chicken can affect which way the minecart is going on Powered Rails depending on where the chicken is looking. It can force the minecart to go upwards on a Powered Rail where minecarts with other mobs always go downwards. As seen here: https://www.youtube.com/watch?v=V3AqOqHxkBk
ImperialPC
It's similar but it doesn't include the issue that the chicken can affect which way the minecart is going on Powered Rails depending on where the chicken is looking. It can force the minecart to go upwards on a Powered Rail where minecarts with other mobs always go downwards. As seen here: https://www.youtube.com/watch?v=V3AqOqHxkBk