So first off I know uploading a blueprint/image is probably needed for full assistance which I can do but not until later. But I am trying to create a blueprint of a city block I created that includes my rails and intersection (2 rails with a fourway at each corner) but I don't seem to understand how to set up the snap to grid because i can't seem to get the rails to line up for the grid. I'm not sure if I am messing up with the dimensions of the grid or with the offsets. Are there any tricks to getting this too work or anything like that?

So I have intermittently played factorio. Scraped through a vanilla playthrough a while back and just did a more serious playthrough recently. I would like to move into using more mods, getting better at using trains and such. Are there any recommended mods for where I'm at to be able to keep moving forward without jumping to far into the deep end of complexity too fast and losing interest?