We create a curve of constant radius of curvature, that is, a static curve, and making sure it is longer than needed so we can cut it in the right place.
We find the end point of the static curve by looking for the right coordinates - just keep double clicking until the coordinates show 697.867 for the x-axis coordinate. We cut the curve at that point.
ℹ️ If the radius of curvature is small you can find the correct place to cut the track by looking for the y-axis rotation value - but as 3,200 m is quite large the x and z position values are more accurate.
Finally, we extend another easement curve, straightening it out to join the second straight track.
Assuming the coordinates are correct, it should weld without any problem 注：以上1，2，3點(diǎn)接上一個(gè)回帖的第8點(diǎn)，也就分別是9，10，11點(diǎn)
Extending a track to join another
The second method calculates easement curves starting at a specific point and extended to join a straight track. The starting track can either be straight or curved, as long as it is in the same direction as the ending track. As the radius of curvature shown by Train Simulator for a track is only accurate to 1 decimal place, the tool uses an additional pair of coordinates to acquire a more accurate radius of curvature for the starting track. If the starting track is straight, the additional pair of coordinates can be left blank.
Suppose we want to extend an curved track to join with a straight track with easement curves, using a track rule with 60 mph speed tolerance and minimum radius 400 m:
This time, it is important where the starting coordinate is. We hover the cursor just outside the end of the bounding box for the track loft - the yellow boundary should still be visible. Double clicking gives us the coordinates right at the end of the track. We enter the coordinates (490.146, 786.863) and the rotation 65.067 SW.
For the second set of coordinates, we double click on another point on the curved track that is not too close, and enter the coordinates (521.558, 802.368). The rotation/quad values are not needed here.
ℹ️ It does not matter where the second pair of coordinates is, just as long as it is on the same track section with the same radius of curvature. If you are starting on a easement curve you can extend a static curve with the easement tool and pick a pair of coordinates before deleting the curve - it will work either side of the starting point.
Finally, we enter the coordinates of the straight track - it does not matter where exactly on the track. The coordinates are (465.935, 775.315) and 69.148 SW.
Clicking Calculate gives us the results.
Since we have already defined a start point, we can start with extending the easement curve to radius of curvature 844.4 m.
Following the rest of the instructions from first example (9 onwards) should result in us joining up with the second track.
Other ways of implementing the curve data
The above instructions show one way to recreate the curve in Train Simulator, but it may not always work because Train Simulator will only show radius of curvature and length for tracks with one decimal place - any hidden errors when laying down the track can easily blow up and make the curve unable to join the second track.
It is for that reason the results are laid out in a table with all the data required rather than a list of instructions.
One other way of laying down the track would be to look at the coordinates for the start and the end of the static curve, and lay down two straight tracks whose ends match up with those coordinates. Then, with Train Simulator's joining tool, the static curve is formed by joining those tracks without easements. The straight tracks are deleted and new easement curves created in place, both of which should join up with the starting and ending tracks without problems.
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