La Rochelle, centre of excellence for the design & manufacturing of very high-speed trains and trams

The provided transcript is repetitive and contains only promotional messages to subscribe to YouTube channels ("Ghiền Mì Gõ" and "La La School"). It does not contain any information about La Rochelle, high-speed trains, or tram manufacturing. Therefore, a summary based on the given transcript is impossible. The title is misleading.

To provide the requested summaries, I would need a transcript that actually discusses the topic of La Rochelle as a center of excellence for high-speed train and tram design and manufacturing.