Why don't we have monerail instead of track trains?

Question

Why don't we have monerail instead of track trains?

Answer 1

Monerail is only good for lite trains. The cost would be to great to build Monerail, its cheaper when they can lease the freight train track.

Answer 2

it has not been proven better, not in terms of safety, or economics.

If it made sense someone would be doing it.

Railroading is a very competitive business

Answer 3

Monorail would be suitable for, say, a high-speed Maglev shuttle, but would not have the flexibility of conventional tracked trains.

Conventional trains are already running at speeds of around 200mph and a French TGV recently reached 300mph although it would not be able to go so fast in normal service.

The Chinese Maglev is capable of around 300mph but this is a light passenger train, used on a shuttle service. It would not for example be suitable for the very heavy freight trains that operate on Chinese Railways, nor for long-distance passenger trains.