Thanks brian, it is every loco so Im assuming that they are shorting on contact across the Vee. ill try out the insulating trick with IRJs. I use those Hornby "staples" to take the power across all roads on the point currently so I think that the wheels are shorting as they make the turn since the area of contact of the wheelset ends up touching the other (opposite polarity0 track during the turn. The straight road is fine and it's not all my points that behave in this way- the longer radius ones are worst which I found surprising.
Many thanks for the advice. Ill experiment tonight whilst listening to the Man U match on the radio.
quote name='Brian' date='9 Apr 2008, 09:33' post='50951']
Assuming your getting short circuits and system is shutting down due to the short, then its one or more of your locos or rolling stocks metal wheels that's causing the problem. As it's touching both rails immediately before or immediately after the insulated frog.
You can do a "Quick fix" and fit two insulated rail joiners onto the ends of the two rails that lead away from the frog (Fit them on the ends of the points two Vee rails). This should remove the problem. You may need to install two more track feeds after the IRJs if you rely on the points switching the track power in both directions.
However you should invest in a Back to Back gauge and check and where possible adjust all rolling stocks wheels to the gauge. Check all locos driving wheels, pony truck, bogie and wheels too, plus all carriage and truck wheels need to be set to the correct gauge as well - You'll be amazed by how many are incorrect.
My web site shows the problem of Insulated frog points causing short circuits . Electrical Page
Then scroll down about 1/4 of the page to the "Insulated Frog point problems and cures" section.