Thank you so much guys, really appreciate the help.
With the layout all drawn I think the easiest way to go at it is what @AireHead has suggested - use a notepad & calculator! Sounds kind of primitive while using a CAD software but XtrackCAD is free and instead of paying $60 for Anyrail, then to re-draw the track plan & get the block lengths, I guess I'll just use a calculator. In any case, after this, I don't intend to be laying new tracks for a long time.
Please find attached the expansion track plan, which is an extension to my existing layout. There was extra space that became available, so I just created a bunch of tracks running around. I don’t model any geography or era but am fond of automation and use iTrain for that.
The dark track stubs are the connections to the existing layout. The thatched part is the existing layout (track plan not shown on this plan). The space at the top & left is the space that is being used for the expansion. The trackage is N scale Kato Unitrack.
Would welcome any suggestions because there are no limitations other than the space & Kato Unitrack.
Thanks!
Krish
Krish_expansion.pdf