> start flashing if the signals are red, a common situation on single line
> track where there is an adjacent crossing loop next to the level
crossing.
> The only odd exception to this is Balhannah Loop in SA where there is a
level
> crossing in the middle of the crossing loop.How this is worked I cant
even
> guess.
> A track cct is as you have summised, an insulated section of track where
> the axles form a short across the tracks to actuate the cct, usually DC
but in
> electrified areas AC , as the traction current cant be isolated .Im not
aware
> in Australia of any other methods other track circuiting to actuate level
> crossings, other readers may know more.
>
> MD
>
There are also situations in which traffic signals and level crossings
occur together. The traffic signals turn red preventing cars from passing
over level crossings often a long time before the flashing lights and
barriers operate. The traffic signals must be tuned to barriers or
somesuch further up the line than the trigger for the barriers adjacent to
the lights.
Tom Zsolt