Diary of a rail fan in Kansai,Japan(Ver.2)

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Why do they omit catenaries?

www.metro-report.com

1st Tram Line in Wuhan opened
By the way, trams without catenary seem to be popular all over the world.
It can be possible by store electricity on fleets.
I'm afraid that trams like that can run out electricity, if trams are stranded between stations due to accidents.
It should have been an advantage of electrified rail systems that carriages are supplied electricity almost permanently, even if they are forced to stop between stations for a long time.

In fact, when I boarded bus from Vancouver to Seattle, it broke down on freeway. And, the driver told passengers that air-conditioning system and toilet were suspended to save fuel.
(I offered him, when I wanted to use the toilet. Only while using, engine was kept running on.)