Modeling topic
Retarder for Plaster of Paris
Hello All,
I am a retired Chemist who also watches "Americas Test Kitchen". The answer to the question concerning the use of baking soda versus baking powder is this. Baking powder has an acid added to baking soda which improves the activity of the baking soda. So, lemon juice and vinegar are weak acids. It is the acid added to the baking powder which is doing the trick. All three additives should do the trick.
Pete
Concord, Ma

[N scale] Turtle Field Layout tour
I all.
Here is a presentation of my layout. The finished part is 3' 1/2 by 6'.
Here is the track plan :
The bench work is a plywood open grid structure, with hole to have a lighter weigh :

[N scale] Building the Colorado Convention Center : Steel & glass scratch built
Hello all. I am new there!
I am a french n scaler, and i am building a N scale layout in my basement inspired from Rio Grande Railroad. The first part is a small town called Turtle Field. This part is finished. The second part called "Spirit of Denver" represent Denver around the merger with SP.
For this part i have started to build a model inspired by the Colorado Convention Center. I love this building because the Ligth rail is passing throught.
This buildding have a structure in evergreen strips :

CY&PRR - Freytag Foundry
When I first saw the articles in the April and May 2009 issues of Model Railroader by the late Dean Freytag, I knew I wanted to build it and I knew it would be right for Blue Island on my layout. It seemed like such a large project, I didn't get to it until 2014 after retirement, and it was a dead-of-winter project taking 150 hours and over 1,300 pieces of styrene sheet, strip, and structural shapes.

Good pitch
Adding "pitch" (black tar) around chimneys and roofing is a great detail to add to structures. I always have a hard time applying the pitch whether using scale lumber of a small brush. The pitch always seemed to come out a scale foot wide.

Can anyone Identify These??
I got these from my dad awhile ago and can't identify them any ideas?

IAIS's West End - Alco C420 850 completed
Atlas released their HO scale C420 and RS36 in factory Iowa Interstate paint nearly six years ago. In that time, I've often been tempted to buy them, but resisted, since the prototype units were no longer on the roster in the 2005 era I model. My willpower finally met its match earlier this month when friend and fellow IAIS modeler Scott Thornton offered to sell me his IAIS C420 850 and RS36 900 models for next to nothing, both with Tsunami sound and working beacons already installed.

Helix Adventure
We will be following along the progress of the two helices for my N scale ARZC. The helices are each 18" radii with Atlas code 80 track nailed to 3/8" plywood. Each turn of the helix will be constructed with 8 chords of the 3/8" plywood, each chord will be joined by a biscuit and then 2" tall blocks will create the space between levels. One helix is 6.5 turns next to the classification yard and the other is 5 turns in the corner where the branchline starts. The branchline will be on 0.25 turns of the second helix, above the mainline.
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