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DT
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The motor's peak current use will be when the loco's gears are stalled. Not just when the loco runs into a buffer. Most OO locos will draw over 1 amp when stalled. If you think you will never stall the motor and gears, then install it as the nominal draw will be well under 0.5 amp.

Take a look at some of the reviews that I did where I measured the current draw whilst performing horrid experiments on the locos. This one for example: A4 Review.

To stall, you have to jam or block the wheels or gears. Even going up an incline with an overloaded train will just spin the drive wheels...
 
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