Gradients - converting NSWGR 1:xxx to Trainz % ??

[3801]

Probably a stupid question with a simple answer but I have old NSWGR Curve & Gradient drawings (they date from 1923) and am unsure of the method of converting from the "one-in-xxx" grade measurement as used on the profiles to the Trainz "xx.xx%" measurement in Surveyor.

For example, the profile might show consecutive grade profiles as "...|88|110|L|..." (that's just an example of three of them straight from one of the drawings. The vertical bar is where one finishes and the next starts.)

I know that it means 1-in-88, then 1-in-110, then Level.
So what formula do I use to convert to the percentage measurement?

Thanks,
Bruce

 

[H222]

http://www.trainman.id.au/grade.htm

Jamie

 

[hert]

http://www.trainman.id.au/grade.htm

Jamie

Thank you.

 

[H222]

You're welcome hert, when you get a thanks from someone it makes helping people worthwhile

 

[3801]

Aaaah! Excellent!

Thanks, Jamie.....just what I needed.

Bruce

 

[mjolnir]

To explain the process a bit, at least in terms of US railroading, the percentage of the grade (gradient) is calculated by dividing the amount of the change in elevation by the distance over which that change occurs, and multiplying by 100. So, if the change in elevation is 1 unit over a distance of 88 units, divide 88 into 1, and multiply by 100, which should be about 1.14 percent. The grade is considered positive if it is measured uphill, and negative downhill, but in most cases, it is simply referred to as an absolute value.

ns

 

[3801]

Thank you for the explanation.
Fortunately I can put my slide rule, log tables and abacus away and now click on that little Java calculator.

Bruce