doodling on plexiglass

That's an interesting technique. What kind of pens work best?  I usually make up a few sheets of my room plan on graph paper when I do preliminary designs . I think one advantage of paper is it can be saved to compare the designs but I guess you could photograph the plexiglass for reference before you erase it? .....DaveB

Dry erase markers

i am using dry erase markers. I am photographing the doodles. Eventually I will do a master drawing on paper. I the meantime this works well for getting the ideas flowing and saves a bit of paper.

Doodling on Plexiglass

Hello.  Doodling on plexiglass is a great idea, but a roll of white or yellow tracing paper is even better.  You can see through the paper like the plexi, but you can keep each version of the drawing without having to erase or get another sheet of plexiglass (a roll of trace is cheap).  With tracing paper, you can also shift things around, flip, mirror or do whatever you want.  It's like manual CAD!

Jonathan Jones

The Plan

I saw your plan and wanted to make one comment.  Be careful about having the mainline cross over itself at the neck of a peninsula.  It means that when you are walking with your train, you will have to switch sides of the peninsula (maybe more than once depending on your scenic treatment) in order to follow it.  It's better to have the mainline follow the outer edge of the peninsula.  This may seem like a minor thing in the drawing stage, but it can be a real headache once built.  It can also be difficult to scenic realistically.

Jonathan Jones

Good start

Definitely nice to have a big piece of plexiglass to doodle on.  Would it be worth looking at having a wye on the left side of the penninsula to add some operational potential?  You could send trains in multiple directions from that junction.  

Marc Simpson