Amtrak will charge you $15 for the box and $5 to ship. It is a big box so you don't have to remove the wheels. You will have to remove the pedals and depending on your handlebars - either turn or remove and strap to top tube. If you're really tall you may have to lower your seat. Then roll your bike into the box and tape it up. At every station I've been at Amtrak provides the tape as well.