OzOne wrote in message

We seem to get involved in just about anything these days :-)
and I agree with you on the rails except that they are designed to do
just one job, and do it very well.

Indeed. There are many such highly-specialized contrivances in sports and
competitions these days. Take for example the trials bikes--not much good
for motocross or trail riding, but they do what they do better than any
other motorcycle. Same with sub-specialized ski boats, those radical
multihulls built only to break the world sailing speed record, Burt Rutan's
various aircraft designed with a sole purpose in mind, F1 cars, and so on,
ad infinitum. It's hard to be critical of such creations as a lot of
technological fallout makes its way to the things we buy and use daily.

Max