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My experience would suggest you have a significant voltage drop between your transformer and the actual track.  You didn't say type of track or how long your track, but if close to your room size then the wiring size is contributing to the loss.  If you have a simple volt meter you can put one lighted car on the track and then measure the voltage.

Your engine requires x amount of watts to run at a particular speed; it is going to get that from volts or amps. If your engine needs 25 watts to operate and your voltage at the track is 18 volts, then your current draw will be around 1.4 amps.  If the actual voltage at track is 12 volts, your current draw will be around 2.1 amps. 

I would run the voltage up to 21/22 volts to see if your current draw drops.  I would also suggest 12/14 AWG wire for main and 16AWG for drops. Depending on size of your layout you might consider more drops.  I've seen some recommendations of no more than 10 track joints for each drop with the drop in the middle. Some tracks can have poor connections between the rail joiners.

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