Is there a wireless adapter for laptops when traveling

[marshar092651]

Hello,
I ride AMTRAK often and they do not have wi-fi on all the trains. Is there a wireless adpater that i can connect to my laptop to get Internet service?

 

[Emerald]

3G or 4G modems

 

[nhasian]

If you have an android phone with internet access you can share the internet with your computer with a free tool like FoxFi