So, my lone signal on the diverging leg of a turnout, protecting a switch and the main. It’s green and the engine starts to rolle forward, it enters the mainline block, the switch is part of the mailine block so as soon as it enters the switch (through a pair of insulated joiners), the signal turns red. The engine continues … Another half inch, and the signal turns Green again! Then another half inch, Red again. Happens with all engines, and they don’t seem to be losing power as their sounds and their smooth forward motion are continuing.
Why does the signal flip back and forth a couple times till it settles? Do I need more feederson the turnout?
If I remember correctly, the BDL has a sensitivity adjustment that can be programmed to another setting. You might try that. Make it less sensitive, or just experiment with it.
Dirty track and dirty wheels may also have an effect. I apply a drop of WD-40 to my finger and then wipe it on both rails and run the loco through it. For me, this seems to improve the electrical contact between the loco wheels and the track.