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The inspiration for my concrete arch bridge

Walnut Lane bridge over the Wissahickon creek

The Walnut lane bridge was certainly most of my wanting to reproduce something similar in HO scale. Although the Walnut lane bridge is a roadway bridge with cantilevered sidewalks, the main structural elements for a railroad bridge would be similar, and I did not try to reproduce an exact copy this bridge, which is right in my neighborhood.

Walnut Lane bridge from creek walking path

The bridge was built in 1908 and at that time was the longest masonry arch span in the world, just now finishing a restoration.

Continuing my Concrete arch bridge

After the second pour was cast and fully cured, I started to detail and assemble the bridge.

Adding stone seam lines stage 1

Then enlarging the grooves with a file, and then a steel rod of the right diameter.

Filing the stone lines

Steel rod in the 3rd stage of scribing the stone lines

I also filed bevels on the vertical edges of the small arches

Filing relief angle on small arches

I then painted the inside walls of the bridge with aged concrete

Testing assembled bridge ( no exterior paint or weathering)

In a future post I’ll talk about painting, weathering and installing the bridge in the layout

Pretty interesting article in the New York Times about a new Model railroad Museum to be designed by Architect Frank Gehry

The Extreme Model Railroad and Contemporary Architecture museum in North Adams Mass. 83,000 square feet with 40 foot ceilings to accommodate 35 foot tall Empire State Building.

The article can be accessed here  Extreme Model Railroad and Architecture Museum

 

COOL

 

Buena Vista Model Railroad Society

After leaving Greely, I went with my friends to Buena Vista CO, a very beautiful area, looking out from their house at 14,000 ft peaks.

Buena Vista view of Collegiate Peaks

Another surprise, was that in the Chafee county courthouse housing the Buena Vista Heritage Museum had a model train exhibit, begun in 1984, all about the railroads and mining in the upper Arkansas River Valley.

Area of model around Leadville CO.

An old photograph showing some of the early building of the model railroad

Old building photo