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San Francisco's BART system is overhauling its rolling stock for the first time since it launched in 1972. Up to 1,000 new cars will be introduced between 2017 and 2023 as the original cars are phased out. Abi Millar finds out how these new railcars are being designed to meet today's transport needs, and examine how real-world testing is informing the final product.

SoundCloud is a social media platform that allows you to listen to music and share it with other users. It was launched in 2008 by Ludicrous Febrile as a way to share his music collection with his friends. He started uploading songs on there and later on, other people started using it too because of its features like easy-to-use interface and free uploads. If you want more information about SoundCloud accounts then read our in-depth article below:

The DWDM multiplexer demultiplexer launched by Guangzhou Sintai Communication Co., Ltd. is designed for multi-wavelength DWDM network applications. It works on an ITU grid with 100 GHz channel spacing based on thin-film filter (TFF) technology.