I suspect the 23mm custom cut piece is used to match the Jackson Junction with a double module length on the opposite side of a loop. Since I try to avoid cutting track for ease of construction I created my “Junction Length Straights” 597 mm long for use opposite junctions in a loop. In most cases I use junctions in pairs leaving a 46 mm short fall that I make up with the 45.5 mm track piece as a small module to fill the scenic gap.
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With 62 and 64 mm pieces available I’m not going to speculate what those others are (I suspect one of those lengths) but 62 or 64 mm pieces can be used to combine standard corners and junctions with “17 inch” corners and junctions.
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Those are the most common uses for gap fillers.
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Otherwise some of the commercially available large “Branchline” junctions are not perfect matches for the large “21 inch” corners and require gap fillers for correction.
Todd Tait, of GS&F T-TRAK (South Central Georgia) has gone a step further with misc. Unitrack pieces.?
He’s built a number of small sections he refers to as ‘slivers’ and ‘slices’ to help fill in gaps caused by irregular width modules during combined setups/layouts. They come in very handy!
