There is a "TargEditTM2_2012SV6R.exe" in each of your folders.
It allows freehand railway line drawing with the right mouse button down in both the world page and the railways page pictures.
A little "OK" button appears at the end of the black line:
If you are not happy with it as soon as you start to draw a new line the old one disappears:
If you click the "OK" button the line is drawn, but it is faint in this screenie:
The same thing for the Railways page:
If you right click in the data grid "XF" column which is coloured it will find the start and end of a line and put the values in the "Start" and "End" boxes. This will allow you to duplicate that line, or delete that line.
Here I loaded the default 11.2 EAW_RRD.DAT
I right clicked on one of those yellow cells in the grid:
You can see the 149 and 203 in the "Start" and "End" boxes.
John. I have found the cause of the node problem you alerted me to, and fixed it