Signal bridges

[Anonymous]

Greetings,

I need some information on signal bridges.

Where are they used and how far apart?

I plan on using one on my layout which is not all that big and use other signals too.

Just curious.

Thanks,

Mark in Texas

[Anonymous]

Here's what I have learned about signals. They are usually used in a a line connects to another. Their main purpose is to make sure two trains are not on the same track at the same time. So at either end of a passing siding, where a switch between two double track mains, branchline connections...anywhere a train may need to be stopped so another train can get around. Another question is are these signals going to be working?
Andy

[Big_Boy_4005]

Bridges are generally used where there multiple tracks. The idea is to place the signal above the track it controls. Some bridges hold signals for both directions of traffic, some only one way. Distance between bridges depends on block length, there is no rule that I know of.

These 2 bridges are about a quarter of a mile apart. One for eastbound and one for westbound through the interlocking.

[DSchmitt]

The following is a very simplified explanation

Signals serve two main purposes. 1) keep trains from crashing into each other. 2) maximize the number of trains that can be run consistent with purpose #1.

Signals are placed where there are potential conflict between trains. some examples: crossing, junctions, where trains enter main lines from sidings.

They are also spaced along a line at approximately even intervals to keep a following train a safe distance from the train ahead of it. The minimum spacing is the maximum distance needed for a train to stop safely short of the next signal.

Another factor in the location of a signal is visibility. In the USA and Canada the engineer is on the right side of the cab, so the prefered location is to the right of the track the signal controls. Signals are usually mounted on signal masts (poles) along side the track. Bridges are more expensive but would be used where the preferred location is not practical for some reason. Some reasons are: 3 or more signalized tracks, or a location where there is an unsignalized track immediately to the right of the signalized track. On the bridge the signal is normally positioned over the right hand rail of the track it controls.

[ClinchValleySD40]

There is an excellent chat group for signals at yahoo. If you really want technical info, I can put you into contact with a super expert that can give you almost exact measurements on any type of signal installation.

[cwclark]

if you are interested in scratch building the entire signaling system for a mainline and a siding, go to the article library at http://gatewaynmra.org/ and look under electric and electonic projects.

[Anonymous]

Greetings,

I ordered a signal bridge from my LHS from Model Power in HO and plan on wiring some lights in it.

What do you suggest? I plan on painting it silver and use some colored lights or LED's.

Mark in Texas