We had already described the construction of the secondary line portal here. The left helical landscape orography is partially completed. We then proceed with the installation of the overhead line.
After assembling the LS poles, whose construction topic you can find here, we test the correct positioning of them to ensure the perfect alignment of the contact wire with the pantographs engagement. The curve is tight and the poles are very close to each other.
Once the right position has been found, we proceed with the painting and final installation. The plinths are 3D printed with PLA filament.
We then install the automatic tensioning device pole for the catenary wire.
We stretch the phosphor bronze wire between the pole and the collection winch under-board. Then we proceed welding the steady arms, the catenary wire and the droppers.
Once the welding is complete, we paint the catenary with a very dark green.
The automatic tensioning device, inside the tunnel, is made with a guitar machine head and a compensation spring. The correct inclination allows a neat and gradual engagement of the pantograph which will remain free in the hidden layout sections.
The rolling stock inclination on the curve is compensated by the catenary inclination . Everything is ready for testing.
The short video below shows the final overhead line test.