Engineering Blog

JACKS interlocking is now operational. Doesn't look like JACKS, just west of Mt. Union? Be reminded of a much earlier post, where I explained that JACKS is the interlocking immediately west of LEWIS. On the model railroad, this is the control point immediately west of LEWIS. As such, I call it JACKS. It is actually the entrance to Altoona staging.

Altoona Staging is now operational. Eventually staging will be 20 tracks wide, but there are four tracks open to allow run through of the four corresponding main line tracks. The view above is westward, which becomes Harrisburg/Enola Staging. Behind the vantage point of the photographer is JACKS interlocking.

JACKS interlocking is coming along well and ahead of schedule. All track is in place. Remaining are installation and control of 16 turnouts and four track power feeds.

Despite spending most of May preparing the railroad for its first open house -- for the PRRT&HS annual meeting -- this quarter proved very productive on the construction calendar.

WALL interlocking is completed and fully operational per schedule. Harrisburg/Enola staging is operational, with 20% of trackage in place.

As previously briefed, construction of Altoona staging was delayed so that it may be constructed in parallel with JACKS interlocking. Although scheduled for third quarter, ll of the right-of-way (benchwork) has already been completed and rail is being laid.

 

Looking for some suggestions on engineering... I'm building my Granville Bridge on the workbench. It's a custom configuration of the Model Railroad Stoneworks Rockville Bridge kit. Amazingly, the specs are nearly identical (See The Granville Bridge Project).

Half of LEWIS interlocking is situated on top of the bridge deck. Specifically, three sets of crossovers. The bridge is made of Hydrocal. The roadbed is a half inch of Homabed. The issue is control of the turnouts.

Just west of the Lewistown station is the first of many crossings of the Juniata river. This, the Granville Bridge, is home to the west half of LEWIS interlocking. The tower was just east of the bridge's end. In that the PRR Middle Division in HO Scale includes LEWIS interlocking, this spectacular bridge will be modeled.