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DT
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4,794 Posts
0.5amp should be fine for most modern locos. A stalled motor is another issue though.

If you take a look at some of my first reviews, I measured the current drawn on the decoder under different circumstances.

Reviewing the Hornby A4 and testing the Arnold 81201 decoder - designed for N scale:
The 81201 can handle 1.5 amp. The A4 model draws 0.15 amp when rolling by itself; 0.25 amp when held stationary at the buffers, but with wheels freely turning on the track; and 1.3 amp with the motor stalled (wheels not moving at all - with current applied to the motor).
Now it is not probable that the wheels will completely stall whilst still on the track under DCC power, but if they did, it would probably fry the R8215 decoder as it only has a 1 amp surge allowance.
 
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