The U36 has more features listed than the U33. The two I see added are (1) the Current speed, fuel level dialog and refueling sound effects, (2) Track IR sensor for use with sensor track. These items are not listed in the U33 features. For me the IR sensor is important since I have three S gauge sensor tracks on my layout. In addition to the U33 I already have on order I plan to buy a U36, a Legacy Berk and the Vesuvius Crucible sound effects box car.
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