On the MTH dcs system, one can access the milage of the engine. How many miles have some of yours ran? What would be high milage in your opinion?
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One with another 'e' in it. 
I've seen some with over 50k miles on the odometer.
-Greg
I once placed a brand new PS3 4-4-0 American on the tracks. The cronometer said zero hours and the odometer said 6,887 miles. I have another PS3 engine (don't remember which one) that had very few hours but the odometer had so many miles on it that it would have had to exceed the speed of sound for a while to get there. Never figured out why this happened but MTH is the only place mileage can be adjusted.
I've had similar on several engines over the years. (Way before PS3. My first one with this problem that I actually had MTH deal with was an R21 subway set, from the very first year or 2 of P2)
I have noted on one or two more recent models that this problem has shown itself when I was operating at a lower voltage (I do not use constant 18V bricks, I use an adjustable transformer to feed the track).
I noticed this because when I first saw it, I said to myself, "Geez, another one that's going to have bogus miles on it forever?". But then when I powered down and back up (at higher voltage this time - closer to or at 18V), the problem was only temporary and it "healed" and showed the actual correct number.
I cannot say if this is a true cause and effect (so may have no impact whatsoever on some models), but it's possibly something to consider if you manually set the voltage and were running lower than 18V.
-Dave
There was a known problem occasionally with the PS/3 boards that the mileage was off in the weeds, I never heard a decent explanation of why that happened or if there was any way for the tech to adjust it. I believe it's strictly an MTH Factory adjustment.
