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[quote user="rckingsnorth"] Wheels, what size to use??? When replacing wheel sets, axle length can be important. Intermountain is 1.002" long (all lengths are +/-) Bachmann is 1.012" Kadee is 1.017" Bowser is 1.025" Excessive endplay (length too short) will cause the car to sit lower and tilt from side to side.  Too long, and the wheels bind. The old Athearn blue box trucks used 1.040".  The Kadee 1.017" seem to work OK, perhaps because of the rounded axle ends. You will find significant variations in a single manufacture's trucks, probably based on the China source.  I test the supplied wheel set for end play, and then test different replacements for best fit. <div style="clear:both;"> </div> [/quote] This is a very good point to make.  I recently bought a whole bunch of code 88 Intermountain Wheelsets (they were on sale) to replace the code 110s on some cars.  Ive discovered that they dont fit on Atlas cars, so I will need to find another source (NWSL has different axle lengths I belive). From my memory, I did not have any trouble installing Intermountain wheelsets in Accurail cars. Anywho, for resistor wheelsets, you will need to discuss that with your club.  They likely have an exact standard stating the resistor value and part number required to achieve occupancy detection.    Generally speaking you will want in the ball park of 5k-10k ohms of per car to acheive single car detection (depending on the type of block detector and wiring configuration).  Again this is a question for the club.   If they specify two resistors per car, then put two resistors per car.    I can tell you that I know a guy who did two 20kohm resistors per car and a single car did not trip the circuit (not sure what detectors he was using).   It took him 1.5 cars (or three trucks/3 resistors) to get occupancy.  Two 20kohm resistors on one car equals 10kohms of resistance per car.    I will likely use around 15kohm on 2 trucks.  Im preping for this by only painting the outer axels on the cars, leaving the inner sets bare metal on the back and axel. If your club is requiring you to install resistors on cars, they should have a set method for doing so and someone should be able to teach you.
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