Hi and welcome to Trainz.
It might not come as a suprice to you that everyone payed money for this game; you are not alone

. If you are going to trash it, that will most likely only be your problem, not ours, so no need to inform us about that.
Now that we have established these things, lets see what your problem is.
Go into surveyor and press F6 (or just click on the 6th tab on the right-hand side of your screen). It sounds like you made one of the layers hidden. Check for the "eye" icons and see if one of those is closed. If so, re-open it and your hidden cars will show up again.
Since you are a new player, you probably also did not patch your game. To check: See if the number in the bottom-right side of your start-up screen shows the number 49922. If not, you have to patch your game, which might also be a reason you get weird problems.
Edit: Scott more or less beat me to it.
I like the grammar and spelling comment btw.