Links Not Underlined

I have a site at http://www.steamtraininfo.com

I have set it up with a left sidebar.

The settings in appearance are: container width 1160 , content width 70% sidebar 30%

I have inserted a table, that contains text and hyper-links, in the sidebar and footer.

The links are not underlined even though they work when the correct text is clicked.

What must I do to fix this?

Thank you for the time.

The page I need help with: [log in to see the link]