NSN presents the first in a new series, Scenic Helpers: SH001: Tunnel Portal #11, sized to allow extra height railcars roll through a tunnel that captures the look, feel and texture of the real thing. This "massive stone" outcropping comes complete with all the the detail shown above.
The portal is a huge 6” x 9” x 1” urethane casting made from a mold created by doing what the big guys did… (Blasting powder and dynamite! No we didn’t use those...we went a little more modern)… It is made from a slice of real rock with the portal cut out using a very expensive diamond saw blade, that cut away a slice of the portal at a time.
Until, after quite a bit of work, the correct portal shape emerged from the rock.
As with all things railroad, the portal was surveyed from the railhead up to assure clearances that conform the N Trak’s Modern Track Clearances: the N scale standard.
As you might suspect an RTV tool was made for casting replicas of the original sculpting. Now, for the first time in N scale, you really can put a great face on your favorite tunnel ... with NSN's Tunnel Portal #11.

$28.95
LIST: $34.99