In this demo, we will show how our railroad diagram library can be an effective, practical tool for automatically visualizing many kinds of syntaxes in software manuals and documentation. Applications include: (i) regular expressions, both classical and modern (with capture groups, lookarounds, etc.), such as are used in common lexers; (ii) context-free grammars in common notations like EBNF or in the input formats of popular parser generators like Menhir, visualized as a collection of cross-referenced railroad diagrams; and more speculatively, (iii) structured control flow graphs composed of sequences, conditional blocks, and loops.