🚀 go-pugleaf

Thanks for the suggestions.  I agree with Chris that the patch would make it
too easy.  I'm also wary about running software hacked and posted by someone
I don't know - even though Josh Drexeler's hack gets enthusiastic reviews on
many web sites.

One rail-to-maglev upgrade idea I had was to build the connecting maglev
tracks on alternate routes, then demolish the rail stations, replace them
with maglev stations and connect them to the maglev grid - that reduces
downtime.  When I tried to do it, I realized that my current rail occupies
the most efficient routes.  My next experiment - I'll build duplicate rail
routes to keep the trains running while I replace the old routes with maglev
track, cleaning up the system as I go.  Then I'll demolish and replace the
stations and trains.

One idea for future releases, if any, of this game: hybrid locomotives.
These would be unimpressive trains, high price, high annual cost, low speed,
low horsepower, with the ability to run on more than one type of rail.

Another: It should be possible to change the size of a rail station without
demolishing and replacing it - simply add or remove a platform or lengthen
or shorten a platform.  It would therefore be possible to add a monorail
platform to rail station, thus allowing a laborious but smooth upgrade.