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Contact track K-2295 - C-24995 and various M-tracks
 Joined: 29/09/2011(UTC) Posts: 35 Location: Græsted
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When and especially WHY did Märklin begin to caution the use of "kontakt-gleis" ( instead of "schalt-gleis") because the longer closed circuit might damage solenoids in turnouts and signals ?
After all, back before "schalt-gleis" was introduced around 1964/65 the "kontakt-gleis" was heavily used for triggering solenoids in turnouts / signals. And Märklin still uses "kontakt-gleis" to trigger level crossings.
Have the solenoids changed ? |
Yours sincerely / Mit freundlichen Grüßen / Bien cordialement Mr. Christian Vinaa http://www.vinaa.dk/trains
...... Meanwhile, aunt Martha, having taken a tramp in the woods, is lying in a ditch at the edge of town ......................... |
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Joined: 12/08/2006(UTC)
Posts: 9,277
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It´s still same function. |
H0
DCC = Digital Command Control
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Joined: 16/02/2004(UTC)
Posts: 15,443
Location: DE-NW
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Originally Posted by: Goofy  It´s still same function. Thank you very much for that qualified post. Märklin added cut-off switches to the solenoids for C track and K track turnouts to prevent them from overloads. So obviously those solenoids are less robust than earlier models. With digital operation, effective track voltage can be around 22 V - much higher than the 16 V used with analogue operation. |
Regards Tom --- "In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS  |
 1 user liked this useful post by H0
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Joined: 16/02/2004(UTC)
Posts: 15,443
Location: DE-NW
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Originally Posted by: auntmartha When and especially WHY did Märklin begin to caution the use of "kontakt-gleis" ( instead of "schalt-gleis") because the longer closed circuit might damage solenoids in turnouts and signals ? The 446 signal manual which was available for download under marklin.com (print code M 03 55 st, so maybe from 1955) contains a warning that, to prevent overheating of solenoids, contact tracks should not be installed where trains are likely to stop ("To avoid overheating the solenoids, it is recommended to avoid installing the contact track sections in places where the train is normally stopped or parked.", page 6). When: Not sure if this is the earliest warning. Why: To avoid overheating. BTW: With a loco parked on the circuit track, this will also give you a permanent contact there, so overheating can also occur with circuit tracks (if overheating is a problem). Apropos: Both trucks of my Märklin V 100 trigger my M track circuit tracks. I don't know other rolling stock that triggers those circuit tracks without slider, but in the case of my V 100 it disturbed my application as I expected one pulse per loco, but got two pulses from my V 100. |
Regards Tom --- "In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS |
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 Joined: 04/02/2011(UTC) Posts: 3,563 Location: Paris, France
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Originally Posted by: auntmartha When and especially WHY did Märklin begin to caution the use of "kontakt-gleis" ( instead of "schalt-gleis") because the longer closed circuit might damage solenoids in turnouts and signals ?
After all, back before "schalt-gleis" was introduced around 1964/65 the "kontakt-gleis" was heavily used for triggering solenoids in turnouts / signals. And Märklin still uses "kontakt-gleis" to trigger level crossings.
Have the solenoids changed ? Hi For quite some time (before WW2) Märklin was using large single solenoids to drive switches using a rachet mechanism Here is a 1950 solenoid with ratchet for a signal  . Then, in 1951, M released full size single contact track and double solenoids motors on switches and signals. Here is the first appearance of double solenoid motors here on a 4 solenoid DSS (Double Slip Switch)  This is to show that the solenoids are getting smaller so faster but less resistant to overheating The tolerance for trains to stay on those contact tracks was medium and permanent damage started appearing after one minute (bending of the nylon solenoid core that made harder for the metal core to move. Then around 1964 /1965 appeared the slider-operated contact tracks (Schaltgleis). Not only those were direction dependent but they would deliver only a short pulse reducing drastically the risk of burning solenoids. Later in 1996, Märklin introduced its C Track with its compact solenoids with end switches. Very fast, compact but burning rapidly after a few seconds Cheers Jean |
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1 user liked this useful post by JohnjeanB
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 Joined: 23/07/2014(UTC) Posts: 8,475 Location: ENGLAND, Didcot
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Originally Posted by: JohnjeanB
Then around 1964 /1965 appeared the slider-operated contact tracks (Schaltgleis). Not only those were direction dependent but they would deliver only a short pulse reducing drastically the risk of burning solenoids.
"... deliver only a short pulse ..." still assumes a loco or piece of rolling stock with a pickup shoe doesn't halt with the shoe holding the rocker in actuated position. It is still possible for a solenoid to overheat with these contact tracks.
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1 user liked this useful post by kiwiAlan
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Contact track K-2295 - C-24995 and various M-tracks
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