measuring current draw in DCC

[nachoman]

Your current draw should be proportional to how many "loads" (locomotives) are in each district. I would assume each decoder draws a small amount of current whether the locomotive is moving or not. But, if the loco is moving, the current draw should be much more than if it is still. In other words, your current draw for each district should be different depending on how many locos are on the track and how many are moving. An ammeter will tell you how much current you are drawing, but that will vary depending on how you are operating your layout.