Here is the inside of my version of Lynn's card --
If you look at the tutorial, you will see that there are three layers on this card, separated by small "boxes" to pop them up separately. I made the trestle using my Cheery Lynn lattice die, cut in half. You can't see the oval cut-out part behind the trees layer, so I took a photo of this layer to show you.
I created the cut-out portion by cutting with a Petite Ovals nestabilities die, and then cutting a frame using two different sizes of the ovals.
When the card is finally constructed, it is a bit bulky; so Kim Score, who wrote the tutorial for SCS, suggested putting a belly band around the card when it's closed. I made the band using multiple images of the railroad track from the MFP set, On Track. The locomotive is also included in the new Train Talk set. Here is the front of my card.
If you have some spare time, you should give this technique a try. It was very fun!
Stamps: Mark's Finest Papers - Train Talk, On Track, North American Woods (sentiment on front)
Paper: MFP Blue Skies, Licorice Whips, Snow Storm Smooth, Cherry Slush, Hazelnut Tan, DCWV Photos 2 DP
Ink: Memento Tuxedo Black, Tim Holtz Distress Barn Door
Accessories: Copic markers, Cheery Lynn Lattice die, Spellbinders Petite Nestabilities, Double-ended Tags Shapeabilities, Cuttlebug Clockworks embossing folder