virginhst539 Posted July 31, 2016 Share Posted July 31, 2016 Has anyone got any info on OHL where the wire needs to fit under a bridge or in a tunnel and what sort of OHL can be found in and around stations on platforms? Link to post Share on other sites More sharing options...
porkie Posted July 31, 2016 Share Posted July 31, 2016 Have a look at these https://www.google.co.uk/search?q=25kv+ohle&client=ms-android-sonymobile&prmd=sivn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiM6piTiZ7OAhXlI8AKHX8kAJUQ_AUICCgC&biw=360&bih=558#tbm=isch&tbs=rimg%3ACWtZHIasEA90IkDVJ8VSb2AcNM3z4bsjqus0_1sAOE4zBLGuasq7bwUYaMHd6D3CEcclKuWZq4iNTwMcwe08t4uYxWh_1P6u_1zTG7AKhIJ1SfFUm9gHDQR2OUp-eyEmlEqEgnN8-G7I6rrNBHOjF6tIKV0cyoSCf7ADhOMwSxrEZqOay--OJtmKhIJmrKu28FGGjARau-klx9x3hAqEgl3eg9whHHJShHOjF6tIKV0cyoSCblmauIjU8DHETVdzeS8XZ7VKhIJMHtPLeLmMVoRKu0y0QZZbkgqEgkfz-rv80xuwBGxn73_1zCi71w%3D%3D&q=25kv%20ohle Link to post Share on other sites More sharing options...
RMweb Premium Clive Mortimore Posted July 31, 2016 RMweb Premium Share Posted July 31, 2016 Has anyone got any info on OHL where the wire needs to fit under a bridge or in a tunnel and what sort of OHL can be found in and around stations on platforms? I have a few bits and bobs. As shown in Porkie's link. Which type of system are you modelling, Mk1, Mk3, 1500v Dc or one of the newer ones? And which line? It is easier for me to sort out the relevant drawings than bombard you with tons of drawings. Link to post Share on other sites More sharing options...
virginhst539 Posted August 1, 2016 Author Share Posted August 1, 2016 Roughly based on Scottish ecml which I think is the MK3 type Link to post Share on other sites More sharing options...
Titan Posted August 1, 2016 Share Posted August 1, 2016 Hopefully this will tell you all you need to know, do be aware that it is diagramatic and that the x scale is several times bigger than the y scale! Link to post Share on other sites More sharing options...
virginhst539 Posted August 5, 2016 Author Share Posted August 5, 2016 Cracking bit of info, think a trip out with the camera will be next to have a look at the various mast set ups Link to post Share on other sites More sharing options...
Pete the Elaner Posted August 24, 2016 Share Posted August 24, 2016 Your camera will be the best source of info. I am glad I took mine out to photograph some tunnel mouths. Clive is going to mock me here because I don't know much of the terminology but here goes: The pictures int he replies do not give any info about the upside-down style of register arms. These are used under bridges where there is limited clearance. Most bridges have limited clearance because they were built long before OLE was installed. A large part of electrification work is to lower the running lines to give adequate clearance for OLE. The 'upside-down' config allows the catenary wire to drop to just above the contact wire & often also drops the contact wire to below standard height. You can see such a configuration in the bottom right of the first image. Here it is unusual in being mounted to a lattice structure. The register arms are more often mounted to a H mast. Tunnels are slightly different. Most were built in the age of steam so there is loads of headroom to allow steam & smoke to lift slightly & allow the air to be displaced by the oncoming train. Most commercially available tunnel mouths such as Peco's are therefore much shorter & fatter than most. Apologies for the picture quality but the only way to get this pic was from a passing train. It shows a Mk1 mast with extra register arm to drop the height of the catenary wire. You will see different structures because you will be modelling Mk3 catenary. This is Mk1 but it illustrates that there are non-standard structures out there. I guess most OLE layouts will require some non-standard types because modelling vast expanses of open countryside is uncommon. Link to post Share on other sites More sharing options...
RMweb Premium Clive Mortimore Posted August 24, 2016 RMweb Premium Share Posted August 24, 2016 Hi Peter No need to mock anyone. You have illustrated things very well. Close to where I live are some mast were a bridge has been removed which makes viewing them easier without the bridge in the way. You can see that the encumberance is reduced so the cantenary wire can pass under the bridge, in many cases the contact wire is lowered at the same time. Where the clearance is very tight a length of contact wire is spliced into the catenary wire and both run together under the bridge, this wire is called a contenary wire. Link to post Share on other sites More sharing options...
RMweb Premium Clive Mortimore Posted August 25, 2016 RMweb Premium Share Posted August 25, 2016 I thought I had drawn the mast in the photos, found them. This is very basic but shows some of the ways of getting under bridges. The yellow under the bridge represents the minimum clearance (270mm) between the fixed structures and the OLE. The track bed can be lowered, with a lowered contact wire height and with the spliced in contact wire. just didn't draw them as well. Under many bridges there is a glass fibre registration arm to maintain the contact wire position. This depends on the width of the bridge. Link to post Share on other sites More sharing options...
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