Does anyone know what the typical centerline distance between tracks on a PRR 2 track bridge?
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Trainmstr posted:Does anyone know what the typical centerline distance between tracks on a PRR 2 track bridge?
I think you will have to be more specific, such as how big/long of a bridge, and what the maximum allowable track speed is. The term "typical" could be a bit vague. Also, you might contact the PRR Technical & Historical Society and see what they may have in the way of PRR Engineering Standards.
4.5" track center to track center, scaled up to 1:1..it would help if they used a center rail. 
Ok, I couldn't resist but I'm curious to know as well.
The only thing I could find is a document which shows double-tracked lines were 8' 3.5" between the outside rails. This was on the prr.railfan.net site.
-Greg
What Greg says looks about right. this would make them about 3" center to center, too tight for any of the curves we use. So unless you want to narrow the space to cross the bridge, I would base it on the spacing and radius of your curves. This of course depends a lot on whether you run scale length passenger cars and long locomotives. 
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PRR typically used 13' center to center track spacing for double track. That's 3 1/4" in O-scale land.
Greg Houser posted:The only thing I could find is a document which shows double-tracked lines were 8' 3.5" between the outside rails.
Bob posted:PRR typically used 13' center to center track spacing for double track. That's 3 1/4" in O-scale land.
Outside* rail to outside* rail is 8.29'. So with a gauge of 4.71', the center of the track to center of the track would be 13'.
Looks like both Greg's and Bob's data are correct.
Since modern railroad cars are up to 10'8" wide, that leaves only 2'3" between cars. Don't get caught between them.
*Shouldn't that be inside?
Yes, Ron - you are correct - should be inside rail to inside rail....let's just say the middle two of the four..lol
-Greg
Bob is correct. On my Panhandle 2.0 bridge, the track centers are 4 5/8" apart (18.5' apart), but there is a stretch where the two tracks are 3.75" apart (15').
George
