I have a feeling that this may be a stupid question, but…
I have three lines. One of the lines is highlighted in the picture below:
If I select all three lines and try and join them, all that happens is that the two lines at the top of the picture join each other but they do not join the highlighted one below. Even trying to run the join command a second time does not join all the lines into a single polyline.
The lines definitely touch, because I used the select end points when drawing them.
The reason I want to do this is that I want to run the Sweep rail command on a similar group of lines.