N-Scale Tube Tunnel V2

thingiverse

Using design cues from the Hudson River tunnel this tunnel comes in sections. There are enclosed and exposed 100mm sections along with grade changing couplers V2 - I thinned the walls on pieces because it was unnecessarily wasteful. The main sections are now 100mm long. The window/access sections have a low facing wall to prevent any derailments from falling out and over the 5000' cliff. I made two sets of couplers to change the grade, either 2° or 4°. That's 2.2% and 4.4%. There are sections to grade up or down. A portal end connector assumes a grade entering the tunnel at 4° to mate with a vertical portal cap.