Engineering Blog

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As another quarter comes to a close, I share this update on the PRR Middle Division in HO Scale.

This quarter brought the completion of suburban Lewistown (3902) on the Milroy Secondary. This section of the line required a somewhat complicated dual-span, angled bridge over the Kishacoquillas Creek near Electric Avenue. (Photo above.)

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Lewistown (3902), a mile of the Milroy Secondary in the suburbs of town, has been declared operational. This location is near present day US 22/322 at the Electric Avenue exit.

This was the last link to making the Milroy Secondary operational. It also provides a hidden link for continuous run on the upper level for open houses.

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Milroy, the eastern terminus of the Milroy Secondary, is now operational.

The above view is eastward. The track running down the middle is temporary. To its right are two opposing turnouts (see image below). These turnouts will create an approximate 20 degree crossing and will connect to the existing turnouts in opposing directions. The temporary track gets me through an open house in May.

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April 3, 2016 -- A year or more ago, Walthers announced their "Engineered Bridge System", which offeres a variety of bridge components of different sizes that are interchangeable. Their latest releases included four lengths of through girder bridges. Based on the parts and assembly instructions, I am highly confident that they either purchased or subcontract with Central Valley for these bridges. I've used the Central Valley 70' bridges in the past.

At a suburban Lewistown location, right near where route 322/22 cross Electric Avenue, there is a three span through girder bridge crossing the Kishacoquillas Creek. I didn't have the room for all three spans, but two spans was ideal. Since Central Valley didn't offer anything longer than 70', I waited for the Walthers 90' spans, which recently arrived.

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The Allensville block, on the fictional Pennsylvania Midland Railroad, has become operational. A portion of the block, which spans the stairway, was completed last year. This section spans the aisle between the stairway and Big Valley yard.

In the image above, the PM line is the rear track. In the foreground is the Milroy Secondary, between Lewistown and Menzies. The two tracks running side-by-side in the open was a necessary evil.