Jack Russell Training…

Are there any bus/train/etc. services that allow pets to travel as well? I’ve looked into Murrays and they have a no pets policy, and there’s nothing on Greyhounds mentioning pets that I’ve come across.
I have a small dog, a Papillion, so she wouldn’t take up much room if she was to travel, though I’m concerned for her comfort. If she was to spend three hours in a hot, stuffy, ill-ventilated area with the danger of luggage bags falling on top of her crate all the time, I won’t be very satisfied…
Thanks for the help, everyone. ^^
<3 XoXo <3
Yaivi