I got a new comment on my Track Layout Geometry page, a trackback from this great article about the current state of affairs in LEGO train track: LEGO track planning software – a guide by LEGO train nerds
If you’re thinking of putting together a LEGO train layout, there are links to several apps that you can use to design it. My page is still relevant for the tracks you can still get today from LEGO even though they’ve long since discontinued the metal rails. But the Track Designer program I used to generate those images is long dead, and the above link has good modern replacements for it.