Diving Knives

I'm going on a cruise later this year and am considering my options to get to Miami. I intend to go diving while in a port of call and wanted to take a small dive knife with me and I know I'll have something reliable to use if the unfortunate happens. I know that the cruise line is not a problem with it, so I wonder if Amtrak does. Any help you can give would be greatly appreciated.

You really connect with Amtrak.
Overall - the duration of your dive knife is part of the baggage, you should be OK. Airlines allow me to take my dive knife in checked baggage. Can not have in your luggage