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The track - this is a close-up of typical horizontal track which is used around curves and a few level spots, but not on hills, loops and inclines. The bottom layer is 4.5V track assembled in the typical manner. It is used for shape and structural support. The top layer is just the rails of 4.5V track, mounted "pony-ear style" (see the horse ears in the Yellow Castle, set number 375) with plates clipped between studs. The upper track is what the train rides on. It needs to be held from the side to keep clearance under the track for the fence flange on the bottom of the cars which holds them to the track. The yellow plates you see under the track are 2x6 plates which are mounted pony-ear between 2 black 2x4 plates. The yellow plates help keep the gage of the top track from opening up wider than it should be. For 9V wheel sets it is important to keep the gage of 4.5V track at or slightly less than standard 4.5V gage.
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