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Old 03-25-2013, 06:40 PM
Conductor
 
Join Date: Mar 2012
Location: Orange City, FL
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Making tunnel portals out of foam board

I showed my new tunnel portal a few days ago here and was asked to do a tutorial. Well, here it comes
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Georgetown & Allen Mountain Railroad
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Old 03-25-2013, 06:48 PM
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Location: Orange City, FL
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Day one

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!
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Georgetown & Allen Mountain Railroad

Last edited by michaelrose55; 03-28-2013 at 06:30 PM.
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Old 03-25-2013, 06:56 PM
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Join Date: Apr 2012
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Really cool! Love to watch it all come together.

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Old 03-25-2013, 07:24 PM
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Location: Brisbane, Australia
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Looking brilliant!

Mike
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Old 03-25-2013, 07:39 PM
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Very nice so far!!



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Andy Kramer, Modeling the Milwaukee Road in Wisconsin--- The Milwaukee Road is alive and well and running in my basement!
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Old 03-25-2013, 07:48 PM
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Great, Michael Thanks for sharing with us.
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Old 03-25-2013, 08:42 PM
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Location: Georgia
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Thanks for sharing Michael, nice technique...you make it look easy.
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Old 03-25-2013, 09:07 PM
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Join Date: Jun 2012
Location: Cleveland OH
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The portal turned out great, and thanks for a nice tutorial to boot!
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Old 03-25-2013, 09:53 PM
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Very cool idea! Thank you!
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Old 03-26-2013, 12:08 PM
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Thanks for sharing this!
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