The Anonymous Widower

The Cross-Section Of A High Speed Two Classic-Compatible Train

This document on the Government web site is the Train Technical Specification for High Speed Two trains.

There is a Section 7.14.3, which is entitled Maximum Cross Section

This is said.

The Unit shall have a maximum cross-section of 11m².

The rationale is also given.

HS2 interface – This maximum cross-section has been used in the design of the tunnels.
HS2’s gauging analysis has shown that a Vehicle compatible with the CRN infrastructure will probably
have a cross-section closer to 10m²

A Class 800 train is 2.70 metres wide, so if a High Speed Two Classic-Compatible train is the same width, the height based on the 10m² figure will be around 3.7 metres or about the same as an Electrostar.

The next  section 7.14.4 gives an interesting piece of information.

Tunnels on the HS2 Network include porous tunnel portals in the infrastructure design to mitigate the adverse effects of micro-pressure waves. Therefore it will not be necessary to include micro-pressure wave mitigation features in the Unit design.

Interesting that they are tackling what is best described as tunnel-plop in the design of the tunnels, rather than catering for it on the train. I wrote about this in HS2 Way Out In Front In Tunnel Design For High-Speed Rail.

August 26, 2021 - Posted by | Design, Transport | ,

1 Comment »

  1. Interesting that they can tackle the phenomenon of pressure waves in the design of the tunnels, rather than catering for it in the design of the train, but then again if you have a new design railway you can learn from past experience and the Japanese certainly have a lot of permanent way experience. At least we don’t have the earthquakes.
    The fact that a Class 800 train is 2.70 metres wide, and about 3.7 metres high, or about the same as an Electrostar doesn’t tell the whole story. Electro/Turbostars are a true ‘go anywhere’ gauge profile based on the W6 freight loading guage and as such the detailed profile generally between the rail head and one metre above has to deal with all the complexities of can’t deficiency, https://en.m.wikipedia.org/wiki/Cant_deficiency
    body sway, suspension, platform height tolerance, curving in stations (especially at speed) and all the other things I’ve previously mentioned.

    Comment by fammorris | August 26, 2021 | Reply


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