What's the difference between an empty track and a suspended monorail?

If you mean the circuit structure instead of the driving power supply,

Then there is no difference between the two.

Suspended monorail is a kind of monorail, which is characterized by replacing two balanced tracks of traditional railway with only one track. Similar to the urban rail transit system, monorail is mainly used to transport passengers in densely populated cities. There is also a monorail in the playground to transport tourists. Monorails are mainly divided into two types according to the operation mode and structure-suspended monorails and straddle monorails. Suspended monorail train (also known as overhead rail train) is a train suspended under the track. Another common type is straddle monorail, where the train straddles the track and covers the tracks on both sides.

Empty track, that is, suspended aerial monorail transportation system, is different from subway and tram. The track of the empty railway is above, which is a kind of rail transit suspended on the overhead track. The new energy empty railway refers to the suspended rail train with lithium battery as traction power, which is a new modern transportation system with completely independent intellectual property rights. The system uses the concept of new energy and modern rail transit to create a brand-new modern urban and rural transportation system which is initiated by China and suitable for China's national conditions.