Displays
To make a display, create a row of item frames
Remove the first one and place a sign with the following:
The sign has the following
[display]
then the name of that display
Pressing done should make a new itemframe
On your train sign, on the last line, you can now add to what display it should draw the picture to
In my case, that is 'ExampleDisplay'
Now, when an cart drives over the sign, the photo should appear on your display
