Скачать или смотреть British Rail Class 769 Transport for Wales Rail

The British Rail Class 769 Flex is a type of bi-mode multiple unit (BMU) and tri-mode multiple unit (TMU) which is currently being converted by Brush Traction, and running in service with Transport for Wales Rail and Northern Trains. The train is a conversion of the existing Class 319 electric multiple unit (EMU), a conventional unit type which had become surplus to requirements during the 2010s.

👉If you like it, please follow this channel❤️:
🎥Youtube:    / @traindepot  
Gear used GoPro Hero8: https://amzn.to/3w4YuSJ

The conversion process is carried out by a partnership between the rolling stock leasing company Porterbrook and train manufacturer Brush Traction. The conversion principally involves the addition of a pair of MAN diesel engines (one under each driving trailer vehicle), the output of which is fed into ABB-provided alternators to power the existing electric traction systems. According to Porterbrook, the Class 769's performance under diesel power is either equal or superior to that of a Class 150 Sprinter diesel multiple unit (DMU), and the switchover between EMU and DMU modes can be carried out while the train is in motion.

According to industry publication Rail Engineer, detailed design work on the Class 769 was performed by a partnership between Porterbrook and Brush Traction, the latter having prior bi-mode vehicle experience with the British Rail Class 73 electro-diesel locomotive. Reportedly, over 60 engineers were involved in the design, which required in excess of 45,000 engineering hours to produce over 2,500 drawings, detailing more than 3,500 components involved in the conversion. Additional input was gathered from several of the original units' designers, which helped to compensate for missing and incomplete drawings.

At its core, the conversion work involves the fitting of a powerpack containing a Diesel engine and associated alternator underneath each of the driving trailer vehicles, which drives the existing traction apparatus via the DC bus along with a new return cable. The engine adopted is the MAN D2876, capable of generating up to 523 hp (390 kW) per engine; this powerplant is furnished with a selective catalytic reduction (SCR) system to reduce NOx emissions. An exhaust system is also necessitated for the engine, which uses a layout that is similar to that of a Class 150 DMU, as well as fire barrier and suppression systems to account for the added risk of fire presented by the powerpack.

The cab controls and circuit breakers have been changed to allow the driver to choose between diesel, overhead AC, or third-rail DC (where applicable) power sources. On the 769/9 subclass for GWR, conductive shoegear is fitted to the trailing bogies of the driving trailer vehicles, along with a new power bus and additional changeover contactors installed under the intermediate trailer car and motor car. Furthermore, new and modified electronic control units are also installed to regulate the Diesel engine's power output and to help it emulate the DC conductor rail. Overall, the modifications add approximately 7.5 tonnes to each driving trailer; the additional weight is evenly distributed across the underframe, which imposed several constraints and necessitated the relocation of the original heating equipment to make room. The original suspension and brakes have been adjusted to compensate for the presence of the additional mass.

#class769 #walesrail #BritishRailClass769