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The postwar 6557 smoke caboose Lamp "55-300 is placed in series with  the heater to drop the normal track voltage to the required range".  The smoke heater element wants about 6 volts.  Since that lamp is no longer available has the heater element power circuit been updated with it's own circuit to run on 18v track power?

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I would be cautious running a 6557 with command control locos.    The 55-300 bulb is listed at 6-8 volts,  the element at 6v.  Combined 12-14V.  Conventional trains usually ran off the rails in turns at 16v+.   Normal operating range is 11-14v.    I haven't run my 6557 on 18v yet.   It may not see it.

I understand it was made this way so smoke would be more consistent from lower to higher voltage.

Last edited by VHubbard

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