One thing that has amazed me, coming from the HO and N scale world, is how O scalers (both 2 & 3 rail) seem to run trackage very close to the edge of benchwork.
And I think it is getting worse, as more modelers run scale length equipment, and desperately try to stuff mega-radius curves into limited layout space. 
Jeff C
I am with Jeff. I ran HO and N for years, and they were so light, they could derail easily. I am amazed how some folks run O trains right to the table edge. I dropped an N steamer once. Smashed the front of the boiler. It was a good thing it was the most cheaply built engine I had. Having many problems with my hands and my eyes, I have embraced O gauge. However, I am extremely careful moving the engines. I will have both hands operated on this winter, so I hope I will 'get a grip' as a friend at my church keeps telling me. 
