Lennart's Model Railroad Blog

Lennart's Model Railroad Blog

About this blog

This blog is about my current model railroad layout project; The N scale "Summit" layout, which is a freelanced interpretation of the Southern Pacific Tehachapi tunnels and their surroundings. Or at least, that is what it is meant to be. What it will turn out to be is another matter. The banner photo above shows what I want to recreate in N scale.

Signal sequence in opposite direction

Electronics, signalsPosted by lennart Tue, February 10, 2009 18:28:27

Here is yet another poor quality video. This one aims to show the signal sequence in the opposite direction (as compared to the video in the previous post).

A train approaches from behind. The signal shows green, so the train is free to enter the block protected by the signal. When it does, the signal changes to red.

It remains red until the complete train has exited the block at the other end (which is inside the tunnel). About 20 seconds later the signal changes to yellow, indicating that yet another train may enter the block, but at restricted speed, prepared to stop at the next signal.

The signal remains yellow for about 20 seconds and then reverts back to green. This simulates the fact that the train has exited the block beyond.

In the video, which is composed from a number of short clips, everything happens a lot faster at the end, but you get the idea.

Since the camera I used does not take clips longer than about 10-15 seconds I had to take a bunch of them. Then Denny was kind enough to help me assemble them into a longer sequence. Thanks Denny!

The length of the clips was not my only problem when doing this video. In order for all the signal aspects to be visible I could not have the camera on a tripod in the aisle, but had to have it up on the layout close to the tracks. It also had to be stable, and not move around between clips. The only way to do that turned out to be to attach it to the tripod, with the tripod lying horizontally across the aisle.

But that forced me to tilt the camera 90 degrees. Giving Denny the trouble to rotate the whole thing back later.

That was not the end to it. With the camera in place I could not see the signal lights my self. And I could not even see through the camera viewer. A small mirror positioned behind the camera made it possible to see the scene through the viewer, and monitor the status of the camera.

But i finally made it. Model railroading is fun!

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