I start with a piece of foam board, in this case 300 x 200 mm (12" x 8") big. I use 5 mm thick foam board that I buy from foamboardsource.com
. The vertical line is the center line of the tunnel portal, the horizontal line is the height of the rail head.
As I'm building a German tunnel portal I use NEM 105 as the correct standard for the tunnel dimensions. This tunnel is part of my main line so I need a double track sized portal.
I start by drawing the tunnel opening and then adding lines representing the large blocks that line the portal. The cover paper is easy to pull off.
With a new blade I carefully cut along both lines trying not to cut deeper than about half the foam thickness.
I then start engraving the blocks using a 0.5mm pencil.
I like the different shapes old European tunnel portals had. I have seen one similar to this but I don't remember where. Doesn't matter as long as it looks good!
I peel off the cover paper again...
...then carefully cut along the outer line...
...and then along the inner line.
With the back of my knife blade I engrave the outer...
...and inner mortar lines of the blocks.
This is how it looks so far.
According to the time stamps on the pictures it took all of 37 minutes to do this. To be continued tomorrow!