# Calculating Tie Lengths in an X crossing

In an X you have two routes that cross. Where the routes come together and separate, it is necessary for their ties to be common. As the routes separate, the ties need to get longer to accomodate both tracks. This continues until both are far enough apart to continue with their own ties. In this model, it is assumed that the common ties will split the angular difference between the two routes.

This program calculates the lengths of the ties needed to complete the X. and determines the frog number. You will need 4 frogs.

 ```Explanation of Input Boxes Note: All dimensional units must be the same. Inches, meters, etc. Crossing Angle (degrees) At zero degrees the tracks are parallel and would never cross. 90 degrees is a perfect 4-way intersection. Normal Tie Length The length of a normal track tie. Crossover ties will progressively get longer from each end. Tie Spacing The measurement from tie to tie, not the gap between them. It is the center to center distance. The width of ties is not needed. Snap to Nearest Unit This allows you to select how much precision you need. The tie length will be rounded to the nearest unit you select here. ```
X Crossing Tie Length and Frog Calculator
 Crossing Angle (degrees)   Normal Tie Length   Tie Spacing   Snap to nearest unit Frog Number

Tie Lengths Needed... (click in box)