The rail idea is interesting. I agree with Bracemaker. I think it could help grow the sport, make it more accessible to the masses. For coaching, judging and fun factors you could simply design the tug with seats and a floor above the water in front of the pylon. Think bowling alley, several rails side by side traveling in the same direction. Multiple skiers, coaches observers along for the rides. Disney, Six Flags, etc. Use for tourneys too. The keys may be cost to build, maintenance and corrosion. Would possibly be good for boat sales as more people get interested in the sport. Would be a major change for the current tourney scene and change is often hard for some to get through.