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The part numbers. 5175 and 5180 are the old 4 digit part numbers and a zero was added when LGB went to a 5 digit part number.  So a 5175 is now a 51750.Underworld asked 'why throw two switches at once', and here are two situations:1: If you have a double track with two switches forming a crossover, powering both switches with a single control makes sense.  If the track is not bi-directional, the trailing point switch could of course be left unpowered or even be a spring switch.  But if trains run both directions on both tracks, both switches would need to be powered and it's definitely more convenient - and safer - to control both at the same time.   2: Another consideration is a yard.  The first switch leading off from the main line into the yard needs to be powered by one toggle.  A switch following that to provide two yard tracks would also need to be powered by a second toggle.  But if two more switches, one on each of the current yard tracks, are added to provide 4 yard tracks, then these two can be thrown by a third toggle as only one switch at a time can be used for a particular move and the position of points on the other simply doesn't matter.Those 51750s are not CHEAP.Art
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