I think there is some confusion here that arose from that genomewiki page you linked. BED data (and bigBed) is displayed in the UCSC Genome Browser as "blocks" along the genome, while wiggle data (and bigWig) is displayed as a signal (with a genomic base on the x axis and some value on the y axis). The description pages for each of these formats may clear this up a bit:
The bedGraph format is basically a 3 column bed file with a 4th column containing a score (instead of an item name), and thus is kind of a hybrid between bed and wiggle format. bedGraphs (and regular bed and wiggle) files are extremely inefficient to use as custom tracks on the UCSC Genome Browser because it requires us to store the whole entire file to disk, whereas with bigBed and bigWig we can just request the bit of data we need for the current view from your server, and don't need the whole file (and we cache some of this as well), and so things are much faster.
Which format you want to use to represent your data should depend entirely on what you want to see, a signal graph (bigWig), or blocks (bigBed).
It sounds like you already have bedGraph files, you can convert them to bigWigs via the bedGraphToBigWig utility and then load them onto the browser.
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