Tunnel building for beginners? - Model Train Forum - the complete model train resource
Model Train Forum - the complete model train resource  

Go Back   Model Train Forum - the complete model train resource > Model Train Workshop > Structures Forum
Forgotten your password?

Structures Forum Share your ideas and creations here, including your latest kitbash or scratch-built creation!


Reply
 
Thread Tools Display Modes
Old 10-18-2011, 09:45 AM   #1
jonyb
Conductor
 
jonyb's Avatar
 
Join Date: Mar 2011
Location: Paducah, KY
Posts: 325
Scales Modeled: HO
Tunnel building for beginners?

I'm gonna start forming a tunnel pretty soon that will be on a curve. Both sides will be exposed. I've got 5 tunnel portals to start with, 2 for each end, and 1 for the back where the track will split off to a future expansion. I know that you're not supposed to put switches in a tunnel, but I did. I'm gonna try to make a small section close to there removable for access. That will be close to a wall, so if it's not perfect, that's okay.

The issue I'm looking at is making the forms. I'll cut out facings for the portals from 3/4" MDF, what I'm wondering about is what to make the forms out of. Once they're formed, I'll use plaster cloth.

Any suggestions? I've looked a little for youtube video's, but didn't find anything that really covered what I'm doing. Most mountains or tunnels are close to a wall and are only 1 sided.
jonyb is offline   Reply With Quote
Old 10-18-2011, 10:00 AM   #2
bradimous1
Conductor
 
bradimous1's Avatar
 
Join Date: Mar 2010
Location: Tewksbury, MA
Posts: 356
Scales Modeled: HO
Images: 5
this thread has an image of Massey's tunnel...

http://www.modeltrainforum.com/showt...ghlight=tunnel

you can use screen over the foam to better form the mountain and use drywall mud over the screen
__________________
Brad

I shave my head so I have more time to play with my trains!

Last edited by tankist; 10-18-2011 at 03:08 PM. Reason: Merged posts. next time please edit instead
bradimous1 is offline   Reply With Quote
Old 10-18-2011, 10:40 AM   #3
sstlaure
Station Master
 
sstlaure's Avatar
 
Join Date: Oct 2010
Location: SE Michigan
Posts: 3,629
Scales Modeled: HO
Images: 1
You could also do a cardboard weave for the structure then cover with plaster cloth.

Attached Images
File Type: jpg 101210 Inside Tunnel.JPG (118.6 KB, 273 views)
__________________
- Scott -

Check out my HO build threads: [url]14X16 Switching style http://www.modeltrainforum.com/showthread.php?t=8241
sstlaure is offline   Reply With Quote
Old 10-18-2011, 10:53 AM   #4
tjcruiser
Moderator
 
tjcruiser's Avatar
 
Join Date: Jan 2010
Location: Rhode Island
Posts: 14,706
Scales Modeled: HO ... and growing Lionel O
Images: 64
Several options to build a tunnel:

1. Carve out of wedding-cake layers of "pink stuff" foam sheets.

2. Build a "basket weave" form out of strips of heavy corrugated cardboard, then cover with plaster cloth.

3. Build forms out of aluminum window screen.

Sean (NIMT) offered an excellent tutorial on the latter method ... easy, with great results ...

http://www.modeltrainforum.com/showthread.php?t=6374

TJ
tjcruiser is offline   Reply With Quote
Old 10-18-2011, 11:33 AM   #5
Massey
Dispatcher
 
Massey's Avatar
 
Join Date: Apr 2011
Location: Washington
Posts: 1,929
Scales Modeled: HO and Lego
That tunnel in the post above was just some pink foam formed around the tracks to hide them. I did another couple of tunnels on other layouts here is what I did.











Those were from my first 2 layouts. I dont have any pics of the tunnel from the 3rd layout but it was all done in a similar fashion. If you notice I the first layout there is even a place where the tracks go over the top of the tunnel.

Massey
__________________
A Veteran, whether active duty, retired, national guard, or reserve, is someone who, at one point in his or her life, wrote a blank check made payable to "The United States of America" for an amount of "up to and including my life."

Owner of the South Massey Railway.
Massey is offline   Reply With Quote
Old 10-18-2011, 11:47 AM   #6
NIMT
Yard Master
 
NIMT's Avatar
 
Join Date: Jan 2011
Location: Three rocks south of the Sun
Posts: 5,518
Images: 35
I use plywood or MDF to make my form boards then attach screen to that.
Tunnel outside.jpg

Tunnel mountain finish.jpg

Mountain outside.jpg

Track and Mountain (10).jpg
__________________
http://www.northidahomodeltrains.com
NIMT is offline   Reply With Quote
Old 10-18-2011, 02:40 PM   #7
gunrunnerjohn
Admin
 
gunrunnerjohn's Avatar
 
Join Date: Nov 2010
Location: SE-PA, USA
Posts: 22,051
Scales Modeled: O-gauge 3-rail
Images: 4
Sean, point him to your thread on making mountains, that seems appropriate for tunnels as well.
gunrunnerjohn is offline   Reply With Quote
Old 10-18-2011, 03:43 PM   #8
waltr
Conductor
 
Join Date: Aug 2011
Location: SE PA
Posts: 466
Scales Modeled: HO, HOn3
Her's another way to make a tunnel (the tunnel is the second page).
http://www.railwayeng.com/Newloop/index.htm
waltr is offline   Reply With Quote
Old 10-18-2011, 08:48 PM   #9
bradimous1
Conductor
 
bradimous1's Avatar
 
Join Date: Mar 2010
Location: Tewksbury, MA
Posts: 356
Scales Modeled: HO
Images: 5
Quote:
Originally Posted by waltr View Post
Her's another way to make a tunnel (the tunnel is the second page).
http://www.railwayeng.com/Newloop/index.htm
wow... that is awesome!!!
__________________
Brad

I shave my head so I have more time to play with my trains!
bradimous1 is offline   Reply With Quote
Old 10-18-2011, 08:53 PM   #10
bradimous1
Conductor
 
bradimous1's Avatar
 
Join Date: Mar 2010
Location: Tewksbury, MA
Posts: 356
Scales Modeled: HO
Images: 5
Quote:
Now we are going to sprinkle dirt and rocks all over this
Formation. Then pour diluted white glue on all the rocks and dirt.
1. why would you do this in this order
2. how much would you dilute the glue
__________________
Brad

I shave my head so I have more time to play with my trains!
bradimous1 is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


» Visit These Sites:
LGB World

Or Our European Train Website ModelRailForum




All times are GMT -5. The time now is 03:38 AM.


Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©2008-2013 Model Train Forum