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Why is there no catenary for Nanjing trams?

The reasons why Nanjing trams have no catenary are as follows:

1, the contactless network of Nanjing trams meets the requirements of environmental protection.

2. Nanjing trams have no catenary, which can avoid the safety and urban landscape problems caused by catenary trams.

3. The tram in Nanjing has no catenary, reliable power receiving mode, no pole falling and no speed limit.