I have well tested my layout using all rolling stock and engines to see if I've laid it well enough. Both directions too. At what point should I consider the track, bridges, curves parrellel curves etc to be OK? Should I run for an hour with out failure? Full throttle? long sets? speed through turnouts etc? Sudden stops on inclines etc with long sets? What is an acceptable speed loss for an incline (and reverse, speed up for decline). Also will adding extra ballast to the engine prevent wheel spin on an incline? (hand built engine with Black Beetle drive train, middle carraige of elecric passenger set, currently no ballast). Thanks, TOOT! PS. Please dont tell me my inclines are too steep! Ive used 6' of track for a 3 1/2 inch rise.