More pantograph questions

Nick <g7gex@...>

Some driving trailer (Bt) coaches on the Wengernalpbahn and Schynige Platte Bahn carry patographs. On the WAB these are modern one-arm type and on the SPB somewhat more basic. What are these for?

Are there signs showing the limits of working of 'foreign' patographs, e.g. wider DB patographs into Basel SBB or narrower SBB types into Germany? I have found nothing in my 1982 edition of "Signale der Schweizer Bahnen".

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