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 Posted - March 24 2014 : 8:11:26 PM
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I believe these bridges are 9 inches long. Does anyone know the width?
Edited by - walt on March 24 2014 9:06:34 PM
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Posted - March 24 2014 : 8:44:54 PM
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A hair over 2-9/16"
http://tycodepot.com/
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Posted - March 24 2014 : 8:48:39 PM
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Thank you, Jerry. I have two of them but they're 32 miles away until Wednesday ! I'm doing some calculating for the area where the bridges cross the underpass of the slot cars.
Walt
Luck, usually comes dressed in work clothes...
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Posted - March 24 2014 : 9:21:30 PM
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I have two girder truss bridges to pass over a 4 lane section of slot car track that is 6 inches wide. The bridges are 9 inches long and will cross at a slight angle. The bridges will cross the 6 inch span at an angle, but the angle makes it pretty tight. Question; should I use 4 girder truss bridges making an 18 inch span(s).
I notice these bridges normally have a pier of some type under each joint. If I use an 18 inch span, any good ideas to construct the center area where a common pier in this case, will be right in the middle of the slot car track below.
Edited by - walt on March 24 2014 9:25:09 PM
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Posted - March 24 2014 : 10:02:06 PM
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pretty hard question to answer without actually seeing it walt. I guess my question would be how much space do you have for a possible pier that sits in the middle of the slot car track? And if you go to an 18" bridge span, how will that affect the grade bridge approaches?
At the moment - without knowing any more - I would lean toward keeping the span at the single 9" if possible. If it's over a straight section it shouldn't affect the cars even if its tight, would it?
Sorry to answer your questions with more questions 
http://tycodepot.com/
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Posted - March 24 2014 : 10:56:25 PM
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Hey Jerry,
This photo would kinda duplicate what it would look like using the one 9 inch bridge. Only over a 4 lane section that's not curved. Tight, but in no way would it interfere with slot car traffic. I like the 9 inch bridge best, but it just limits much scenery at the underpass... Thanks again for your input... if I can find my bridges I may make a quick mock up of the area for a photo.
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Posted - March 25 2014 : 01:57:20 AM
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quote:I like the 9 inch bridge best, but it just limits much scenery at the underpass...
Originally posted by walt - March 24 2014 : 10:56:25 PM
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If you used wood trestles for the approaches instead of embankments, you could see more of the scenery since you could see through the trestles, and the trestles themselves would add some visual interest in contrast to the girder/truss bridge. Just a thought...
Glenn
I was thinking of the immortal words of Socrates, who said, "... I drank what?"
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Posted - March 25 2014 : 12:28:49 PM
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| Atlas's bridges are made to work with their sectional track, so the track on the bridge itself is 9 inches.
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Posted - March 26 2014 : 5:14:19 PM
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Dug out the Atlas Girder Bridges today. One photo shows one crossing the 4 lane (which will be an underpass). The other shows two Girder bridges together over the roadway, with no place to locate the center pillar. Looking at the photos, which would be the best to use to make look good.??
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Posted - March 26 2014 : 5:41:06 PM
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Walt, I think the single span bridge is the better looking.
Andy
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Posted - March 26 2014 : 6:34:45 PM
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walt - they both look good from this angle but the 800-pound gorilla is the pier that is needed with the double span. I would go with the single span, as you said - it doesn't interfere with the cars so the closeness of the supports will not be a factor.
On the other hand, Atlas makes an 18" truss bridge ( I have 3 of them on my layout!) that would solve your problem - no central pier would be needed and it's a eye-catching bridge too.
I figure you want to go with what you have, but as the saying goes you're going to be looking at this layout a long time 
http://tycodepot.com/
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Posted - March 26 2014 : 8:36:10 PM
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| Jerry, I believe at the angle the trains cross after looking and measuring, I believe that the 18 inch span is a must. The angle is more than in the photos. I'm glad you told me about the 18 inch bridges... I don't mind buying more to make the layout look good... Thank You!
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Posted - March 26 2014 : 9:06:07 PM
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You are welcome - here is a link to it on the Atlas site: http://www.atlasrr.com/trackmisc/hothroughtrussbridge.htm
http://tycodepot.com/
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