<div dir="ltr">Colin,<div><br></div><div>Thanks for your comments.</div><div><br></div><div>I want to clear one very important thing up. The tag electrified=* is currently being used in OSM to define the *contact system* in use, not the power supply. All railway electrification systems require a sliding contact between train and infrastructure to transfer electrical current.</div><div><br></div><div>Your point about 2 rail systems is a valid one; there may be examples of conventional railways with very low voltage 2 rail electrification. We could use electrification=2nd_rail or electrification=2rail.</div><div><br></div><div>Maglevs, by definition, do not have any contact with the infrastructure and the entire propelling force is derived within the track system. So electrified=induction would be more appropriate.</div><div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>best regards,<div><br></div><div>Garry</div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 11 Jun 2020 at 12:52, Colin Smale <<a href="mailto:colin.smale@xs4all.nl">colin.smale@xs4all.nl</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="font-size:10pt;font-family:Verdana,Geneva,sans-serif">
<p>On 2020-06-11 13:28, Peter Neale via Tagging wrote:</p>
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<div dir="ltr"><span style="color:rgb(38,40,42);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px">At the risk of being called pedantic, or frivolous, surely it should be, "1st+2nd+3rd+4th rail" (after all, it won't work without the 1st and 2nd </span><span style="color:rgb(38,40,42);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px">rails)!</span></div>
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<div dir="ltr"><span style="color:rgb(38,40,42);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px">...or (almost getting serious now) we could just assume that, if the 3rd rail is mentioned, then the 1st and 2nd must be there (otherwise it wouldn't be 3rd rail) and, if the 4th rail is mentioned, then the 1st, 2nd and 3rd must also be there.</span></div>
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<div dir="ltr"><span style="color:rgb(38,40,42);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px">There might be a maglev system somewhere using two conductor rails, which would then be the 1st and 2nd?</span></div>
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<div dir="ltr"><span style="color:rgb(38,40,42);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px">Remember we are discussing the power supply, not the running rails. The power supply only needs the 3rd and 4th. Take away the running rails, jack up the train, and you could still get the motors to turn (safety systems permitting).</span></div>
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<div dir="ltr"><span style="color:rgb(38,40,42);font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px">A serious question arises though... The Wuppertaler Schwebebahn get its power from the 2nd rail (it's a suspended monorail). What do we do with this? electrified=2nd_rail?</span></div>
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