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[quote user="1arfarf3"]Trying to figure out how much movement trucks should have. Have purchased the Kadee red fiber washers as some cars have metal washer(s) and will be installing fiber washers.[/quote] Replacing metal washers with fiber ones will not fix your wheel drop issue.  I use both metal and fiber washers (reds and grey).  The only thing that washers do is raise coupler height.   What width wheels are you using on your rolling stock?  Code 110 or code 88?  Do you have an NMRA guage?  <-this is vital piece of equipment for verifying proper dimensions of both wheels and track. [quote user="1arfarf3"]Is there any specified amount of numeric movement?[/quote] No. [quote user="1arfarf3"]Or any other method(s) to determine?[/quote] Three point suspension is the standard recommendation.  1 truck should turn freely but not be so loose that it rocks side to side.  The other truck should be slightly looser so that it can rock side to side slightly.   Tightening the truck down to keep it from dropping (which I dont think will actually work either) will just invite derailments. Some newer rolling stock is manufactured with plastic tabs that stick down slightly near the bolster on one end that will prevent one truck from having side to side motion. These videos will explain to you what is happening and will give you a start on where to look into what to fix.   Watch this video: <a href="https://www.youtube.com/watch?v=MbSmoUH1Cqk">https://www.youtube.com/watch?v=MbSmoUH1Cqk</a>   And this 4 part series: Part 1: <a href="https://www.youtube.com/watch?v=JBdWvMHEN8s&t=0.s">https://www.youtube.com/watch?v=JBdWvMHEN8s</a> Part 2: <a href="https://www.youtube.com/watch?v=REOKi62aLl0">https://www.youtube.com/watch?v=REOKi62aLl0</a> Part 3: <a href="https://www.youtube.com/watch?v=QV-lBePZrjk">https://www.youtube.com/watch?v=QV-lBePZrjk</a> Part 4: <a href="https://www.youtube.com/watch?v=A2FufQKMW18">https://www.youtube.com/watch?v=A2FufQKMW18</a>
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