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[quote user="unionpacificchuck"][quote user="davidmbedard"] From the Athearn web site..."Key Features<ul><li>Boiler backhead with printed gauges </li><li>Individually applied piping, valves, generators, etc. </li><li>Operating eccentric cranks on both sides operating in correct direction </li><li>Adjustable cab windows </li><li>Headlights and number boards with directional light change </li><li>Five pole, skewed armature motor with dual flywheels for smooth operation </li><li>Pivoting front and rear engines for negotiating 22" radius curves </li><li>See-through running boards </li><li>Smoke unit ready with no soldering required "</li></ul>Sorry Cuda....if you want to run big steam, you will need big(ger) radius.   Even at 24" you are pushing the boundries of this loco.  David B[/quote]Ok you must not know your UP, i am defending Ken MR said both the athearn and pcm would run on 18's and mr was right they do they run fine so he is not pushing the boundries just running on the edge on a brokejn trestles. Once again read up on your UP skills like i have spent my time doing. Don't bother asking me trivia q uestions because i will get them right. no kidding i will.[/quote]Hark! Hear the babble of one unschooled in problem solving.Bottom line, if all 4 axles are flanged there will be problems at tight radius. If there is any flaw like a twist or dip/rise in the rails anywhere the engine will fail to stay on the track.I recall an old cartoon that had a door hinge cut and bolted into a boiler that is sawed in half to accept it.
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