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As a troubleshooting question, how does the light flash? Is it a consistent, regular flash, or erratic flashing? Does it change with engine speed/throttle position? That is, at higher throttle positions, is the flashing less frequent? Different power supplies control with different methods. Some supplies vary the actual voltage to the track, while other supplies provide nearly full voltage, but pulse it on and off. At lower throttle settings, the pulse is narrow with a longer time between pulses. As you increase the throttle setting, the pulses get wider (or longer) and the gaps get shorter. Different people like it different ways. On some locomotives, there are electronics on board (a simple resistor/capacitor circuit) that will smooth out this effect for the lights.

Michael
 

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I would guess that it is a compatibility issue between that locomotive and that particular power supply. One test, if possible, would be to get another similar model loco and see if it does the same. If available, I'd look at the power supply outputs with an oscilloscope and compare them, looking for ripple, pulses, etc. Contact with the manufacturer tech support might give some answers as well.

Good Luck.
 
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