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With 5 amps you will have definitely have enough power. Rather than power districts that strictly are separate power for each districts, you are better off to buy the PM42 which has four separate units in it which can either be for auto reversing or short protection. Instead divide your layout into short protected districts. Go to the Digitrax site and look it up. <br /> <br />So with one PM42 you could divide your layout into 4 distinct sections that would have short protection. So if one section goes down, the other three sections are still functional. The length of track and total track is very similar to my situation. Probably the most engines run at one time on my layout will be 6 to 8 engines. 5 Amps will serve you well. Grab an MR and look at some N scale engines reviewed, you will see the average draw in N scale is around .3 amps so multiply that by 8 and you will see you are well below 5 amps. <br /> <br />Note: I changed the name of the detection unit as I was asleep at the switch and wrote the wrong name in.
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