I think since I first got OpenTTD in 2005 I've put 30% or more of all my OpenTTD play time into 2050 Transport Co. I'm always polishing it and finding new ways to do things. The first game I posted, Hindingworth Transport, was one I worked on similarly when I was playing OpenTTD on my Zaurus.
That reminds me I admire OpenTTD's programmers. I could compile OpenTTD on the 64MB Zaurus itself with no trouble at all. I also wanted to build Wesnoth, which is a much simpler game. It doesn't have anything like bridges over everything, it moves one piece at a time where OpenTTD has to update dozens of train cars and other vehicles in real time, but I couldn't build it on the Zaurus at all.
Today's screenshots show "progress". I found a screenshot of 2050 Transport Co. in 2008, and took a pic of the same area today. It's hard for me to believe it's the same game.
After taking today's screenshot I found Lower Nanstock Heath needed upgrading again. It's been extended to the bridge and a 4th train added. Upper Dunway didn't need all 7 tracks so I took two off and routed the input to Lower Nanstock Heath through the space. Next up for revision are two junctions, one by Dunway Waypoint and a similarly primitive one just off-screen.
Edit: to indicate the quantities of goods being handled on this map, Upper Dunway handles 54% of 4 million litres of water and 67% of 2.3 thousand bags of diamonds every month, but by this map's standards it's something of a backwater.
Well, it probably handles more water than any other station, but it's off the lines which take most of my time. Nothing short of maglevs could handle the quantity of stuff.