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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 

More from Colorado

As I said in the last post, There were visits to several model railway exhibits. The first one was the Colorado Model Railroad Museum in Greeley Colorado. This Railroad has been featured in Model Railroader magazine as well as other publications. It is very well done and has walk ins between peninsulas as well as a balcony giving a good birds eye view of the whole scene from a long walkway.

overall view

Another view from the balcony. Model railroad is about 5,500 square ft.

view from above westside and Nasty Flats

And a view down on Coos Bay at the other end of the display.

Coos Bay loading

Home of the Colorado Model Railroad Museum

Colorado and visit to Intermountain Railway Co.

Visiting friends in Colorado, I was able to further my ongoing summer visits to full scale and model railroad sites. First was the Colorado Model Railroad Museum in Greeley CO, and then the Buenavista model railroad society in Buena Vista CO, both of which I will put up further posts in the near future, but the real unexpected treat was a tour of the

Intermountain Railway Co. the model railroad manufacturer in Longmont CO. Kirk was very gracious in showing the whole operation, from their milling the molds for injection molded parts on their CNC milling machines

CNC milling machine

Small detail parts half mold

Just a few of the many machined molds for various products

To explaining their process and inventory.

Small part of inventory

To talking about their quality control, including a final visual inspection of each and every HO engine and actually running each engine through various track situations. A very impressive commitment to quality, and not releasing anything that is not absolutely right.

Engines ready for inspection

engines in the inspection area

All in all an enjoyable morning and an appreciation of a quality company