HOW TO HIDE YOUR TRAINS TO BE ABLE TO DESIGN

Once you have dispatched your train it is nearly impossible
to be able to design around & under them. Below is an example:
1 I wanted to change the train tracks, so I deleted all previous tracks. My trains were all dispatched and I could not place the new ones. 

2 I bought a train from the store that only costs coins and placed it on my farm that I wanted to place my new tracks. 
3 I bought the track I wanted from the store and placed it on my farm as a guide for my other tracks.
4 I then clicked on the train I bought, selected "Hide" and then selected "Hide all Trains".
I then proceded to lay my tracks - As I went I would reload my farm to check on progress and repeated step 4.
If you are considering buying trees or other decorations and require them close to your trains simply follow the above steps.