Stud Triac is developed on the basis of common thyristors. It can not only replace two thyristors with reverse polarity in parallel, but also requires only one trigger circuit and is an ideal AC switch device. . Its English name TRIAC is the meaning of the triac.
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The new metro vehicles will be equipped with advanced LED lighting technology, which can be 30% more efficient than current subway vehicles. With the intelligent information system, the train can display train arrival and transfer information in real time, which is convenient for passengers to travel. 
The redesigned train compartments are no longer separated by partition doors and the available space is increased by 30%. The doors of the new cars have also become more open, allowing passengers to get on and off during peak hours.
The new subway train will cost more than 1.54 million US dollars (about 9.42 million yuan). Siemens said that the long-term order of the route between Central Station and Waterloo will have 2,500 demand, the vehicle will be automatically controlled by the program, or The train staff operates. 
Equipped with LED lighting, Siemens launched a new subway train
On October 4th, UK time, SIEMENS announced the launch of a full-scale analog subway train to replace the existing vehicles on the London Underground by using fully automated operation.