Hi Erin,
Welcome to Trainz, there are a few things you have to do with Trainz that you do not have to do with other games/sims.
Open CMP, found in the Ts2010\bin folder if you don't have a shortcut to it.
In the left panel click on "search" then select "open fo edit". This will list any items that are open for edit, then highlite all of them, click on "edit" and select "commit". After that is done, close CMP and start Trainz, that will allow them to show up in Surveyor.
Cheers,
Bill69