The Anonymous Widower

The Traction System Of A Class 385 Train

This document on the Hitachi web site is entitled Development of Class 385 Semi-customised/Standard Commuter Rolling Stock for Global Markets.

The Hitachi document gives a schematic of the traction system of a Class 385 train.

This is the description, that accompanies the diagram.

Railway businesses in the UK include ROSCOs, TOCs, and track maintenance and management companies. The TOCs pay fees, called track access charges, which are based on the weight of rolling stock and the distance travelled, and are obliged to pay the track maintenance and management company for the electrical power consumed in train operation. Because lighter trains put less load on the track, they incur lower track access charges. As lighter trains also consume less electrical power, there was strong demand from the TOC to make the rolling stock lighter, right from the pre-contract stage.

There are two types of Class 385, a four-car train set and a three-car train set. The four-car train set has two motor cars (M) and two trailer cars (T) in what is called a 2M2T configuration. For a three-car train set, in contrast, sufficient traction capacity is provided by 1.5 M cars. Accordingly, the Class 385 adopts a system in which the traction unit (converter) is split into two drive systems, with each car having two motor bogies that are controlled separately (see Fig. 4). This means that three-car train sets can have a 1.5M1.5T configuration in which one of the bogies on one of the two M cars is a trailer bogie, thereby eliminating two traction motors and one traction unit drive system. This configuration reduces the weight of a three-car train set by approximately 1.5 tonnes.

Next time you design a train, will you stand more chancw of getting the order, if you think out of the box?

August 10, 2019 Posted by | Transport | , | Leave a comment

The Lengths Of Hitachi Class 800/801/802 Trains

Hitachi’s Class 800/801/802 trains are part of the AT-300 family of trains, with 26 metre long cars.

  • A five-car train is 130 metres long
  • A nine-car train is 234 metres long.

Current trains and ones the Hitachi trains are going to replace have the following lengths.

I think the Hitachi trains will fit platforms designed for these trains well.

Perhaps a five-car train might be a bit short for a eight-car BR standard 160 metre log train. But a six-car Hitachi train is 156 metres long.

Conclusion

Twenty-six metre long carriages seem to work well against BR’s historic standards based on a twenty-metre cars.

August 10, 2019 Posted by | Transport | , , | Leave a comment