I just acquired a second Railking F40PH/Locosounds which I want to use in tandem with another. As per Murphy (his Law) of the three I have (one rebodied) all made the same year they all run different speeds. Now two are very close to the same speed. So my question, would the slightly faster engine be better pulling or pushing the slightly slower unit. The speed difference equals about 1/2 to 3/4 inch gain per loop on a dogbone of 031 that fits on a 4 x 8 foot layout. It's not a high priority right now, but I intend to go through them and make sure everything is lubed, and oiled and then retest them.
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