(eplain.info)Rules

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4.2 Rules
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The default dimensions of rules are defined in chapter 21 of the 'The
TeXbook'.  To sum up what is given there, the "thickness" of rules is
0.4pt by default.  Eplain defines three parameters that let you change
this dimension: '\hruledefaultheight', '\hruledefaultdepth', and
'\vruledefaultwidth'.  By default, they are defined as 'The TeXbook'
describes.

   But it would be wrong to redefine '\hrule' and '\vrule'.  For one
thing, some macros in plain TeX depend on the default dimensions being
used; for another, rules are used quite heavily, and the performance
impact of making it a macro can be noticeable.  Therefore, to take
advantage of the default rule parameters, you must use '\ehrule' and
'\evrule'.