14.11.07
The HUSH switch and crossing
The ‘HUSH’ crossing was demonstrated at Excel in February 2007, and attracted interest from light and heavy track engineers. The ‘HUSH’ crossing eliminates the requirement for wing and check rails, the machined crossing nose and throat gap. Manufactured using the standard rail section the rail wheel is only in contact with an unmachined rail running face. As there is neither throat gap nor nose topping, the track noise is hugely reduced.
The ‘HUSH’ crossing is effective in small or large angle common crossings, and can be substituted for an existing crossing in a turnout layout. It would be possible, by substitution, to eliminate all common crossing noses and throat gaps on any route.
The illustration shows a ‘HUSH’ crossing in a BV8 113A FB turnout.
There are different methods of operating / detecting / locking the moveable section. Logically the system needs to be compatible with the existing switch operation.
The ‘HUSH’ crossing is easier to manufacture than fabricated or semi-welded crossings, and even adding operating equipment, will be cheaper than cast steel crossings whilst offering a superior solution, and considerably cheaper than current swing nose designs.
As the ‘HUSH’ crossing is a new innovation, we do not have years of running data, however the normal reaction from track engineers is ‘But it’s so simple, I can’t understand why we aren’t already using it!’ We have identified sites where the operators are kindly supporting trials of the ‘HUSH’ crossing. The sites will provide results from carrying normal, heavy haul and metro traffic.
The ‘HUSH’ switch is not as advanced as the crossing. Designs exist, a prototype is being prepared and installation site identified. The switch is being developed to eliminate some unsatisfactory features of current switch design such as excessive machining of switch rails.
The ‘HUSH’ switch comprises an unmachined standard rail section, mounted on a sliding system using the plain line fastening and resilience components.
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By incorporating both ‘HUSH’ switches and crossings into a rail system, it is possible to have a virtually continuous rail profile to the rail wheel, with a quieter and smoother ride
We are rail engineers who can see that these ideas offer a vast improvement over current switches and crossings.
We are not accountants, but can see these solutions are more cost effective.
We are not politicians, but investment in a system offering a smoother ride, will be popular with the public.
Tell us what you think – have your say below, or email us directly at [email protected]