http://forums.pelicanparts.com/uploa...1294863282.jpg

When the switch (in the photo, to the left) is thrown, the axle rotates (blue arrows). This causes the arm (red arrows) to shift the side rails to the left. At the same time, another arm causes the center rails (purple arrows) to shift to the right. This other arm is visible in the photo, but I forgot to tag it.

Since railroad wheels (bogeys) have the guide flange to the inside of the track, moving the track to the left (up at the red/green arrow area) will allow a gap to open up through which the flange will pass.

Below the foreground, not pictured, will be a crossway in the tracks through which the right rail of the main and the left rail of the spur will both pass. There will be gaps in the crossway for the flanges to pass through.

Does that help?


http://www.istockphoto.com/file_thum...ross-roads.jpg

http://www.canyonhobbies.com/v/vspfi...NL614063-2.jpg

The middle track (the one with the ridges) is a drive track. it is higher than the carage rails.
In it's current config the track comming from the left is clear
i.e. the carage rails are clear and the drive track is clear.

When they move the drive track over to the right it will move both sections of drive track which will then clear the carage rails for trafic from the right track.

Do you know the source of the photo?
It appears to be a cog-drive rack railway; either a Marsh, used on the Mount Washington Cog Railway, or a Riggenbach, which was used to climb the Rigi Mountain in Switzerland.

http://upload.wikimedia.org/wikipedi...riggenbach.jpg

What happens when you pull a vacuum on a rail car?
http://forums.pelicanparts.com/uploa...1294865054.jpg


I didn't know they had chicanes for trains
http://forums.pelicanparts.com/uploa...1294865114.jpg

LOL remionds me of when my dog tries to run really fast on a hardwood floor and the rug curls up behind him and he doesn't go anywhere.

i can see it.

What tracking system is that? I did some work on one for helos...what a mess!

http://forums.pelicanparts.com/uploa...1294865674.jpg

man, i like that car...

http://forums.pelicanparts.com/uploa...1294865987.jpg
http://forums.pelicanparts.com/uploa...1294866009.jpg
http://forums.pelicanparts.com/uploa...1294866027.jpg

Its used on The Eurofighter Typhoon

"An advanced optical head
tracker is integrated into the helmet system to
provide a high accuracy/low latency solution for
low, medium, and high altitude operations."

And some "other" programs ;)
http://forums.pelicanparts.com/uploa...1294869000.jpg

As my grandparents had a little apartment in Vitznau, I was countless times on the Rigi, it is about 45min from my home away. The pic could really be the Rigibahn, but I cannot tell for sure. The track wide looks European for me and it's not small, as most if not all others with gear-track here

and the random pic of me (hand) and some friends

http://forums.pelicanparts.com/uploa...1294870949.jpg