Railroad Spirals - Japanese Half-sine...is this available in Power Rail Track SS4?

Question

We've been asked by a client to integrate "Japanese Half-sine" spirals into our design...is the "Japanese Sine" option the same spiral? Or are these different? I cannot locate any documentation on spiral types integrated into SS4...also, for some reason, Power InRoads SS4 only offers Clothoid so we've been forced to switch over to Power Rail Track SS4. 
 Thanks for the help!

Chris Key · Answer

Yes, the rail products are going to offer the different rail type spiral definitions whereas InRoads will only supply the road/transportation option (clothoid). From discussions in the past, I believe the COSINE transition spiral is the same as the half-sine transition spiral. When assigning the spiral transition type, you will want to assign the transition as the Cosine. 
 This is not directly mentioned in the link below, but it does provide some illustration and definitions/equations of the transitions. 
 http://communities.bentley.com/products/rail_design/f/5921/t/65919

Kivanch · Answer

Japanese Sine Spiral which is renamed as Half Cosine spiral in the OpenRail Designer uses the following formula. Which as far as I can see is the same as the formula used in Civil 3D. We will also add all the formulas used in the spiral definitions to help document and communities, soon.

Railroad Spirals - Japanese Half-sine...is this available in Power Rail Track SS4?

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