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Old 5th January 2006, 22:48   #1
illinoistrainguy
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Default grade height

I'm a true newbie, even though I got my first train years ago. I've upgraded to MTH Realtrax (O-grade) and want to start using some height. What kind of clearance will I need to be able to have one train pass under another, and how many feet of straight or curve track should I allow for the needed grade? How high are the trestle sets that you can buy?

Thanks for any info anyone can give!
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Old 6th January 2006, 14:09   #2
Don McLean
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Default Re: grade height

Grades are the same regardless of scale. Most people seem to be happy with grades of 4% to 6% that is 40 or 60 mm in the metre. You will find a thread on grades in this Forum. I think it was under On30.
Hope this helps
Don
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Old 6th January 2006, 14:22   #3
disisme
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Default Re: grade height

ill, as don says, grades in the 4% range are pretty normal, purely to compact the space required to get overhead clearance. The elevation is actually in 12 inch to the foot scale, so it doesnt matter if your using Z or G scale, the amount of track required to climb 1" is the same. to calculate your track length, at 4%, you will rise 1" every 25" of track.

Clearance for O-scale... I have no idea...sorry.
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Old 6th January 2006, 16:49   #4
JackH
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Default Re: grade height

To figure out clearance put your tallest car on the track and measure from the top of the roadbed to the top of the car. Add a 1/2 inch or so for safety. When you run the track over the top of another you HAVE to include whatever that track is sitting on be it a bridge or a piece of roadbed.

Trestle sets are pretty much gone these days. Most people want more than just track for scenery. There are 3 magazines that cater to O scale. O Scale Trains, O Gauge Railroading, and 48/ft O scale News. The 1st 2 are the best I think.

O Scale Trains is running a project layout series which started last year and is pretty good.

Got more question-- ask and we'll see what we can come up with.

Jack
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Old 3rd March 2006, 18:46   #5
G Gauger
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Default Re: grade height

Quote:
Originally Posted by Don McLean
Grades are the same regardless of scale. Most people seem to be happy with grades of 4% to 6% that is 40 or 60 mm in the metre. You will find a thread on grades in this Forum. I think it was under On30.
Hope this helps
Don
What everyone always thinks about when designing grades is that.. The clearances for dfferent scales are the problem.. In N - we used 2" clearance - so we actually only really needed about 3 foot of track at each end of the overpass.....

In G - my railhead is 10.5" over the layout's "terra firma"... it took 11 - 12 ft on each side of the trestle I built.... My bridge starts on level... goes 14 ft - then the 6 ft of trestle, then another 12 ft down.... in N that all could have been done in about 10 ft.... instead of 32 ft!
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