%%
%% The LaTeX Companion, 3ed
%%
%% Example 2-2-15 on page I-46 in "The extended interface".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{183.0pt}
%StartShownPreambleCommands
\usepackage{titlesec}
\newcommand\secformat[1]{%
  \parbox[b]{.5\textwidth}{\filleft\bfseries #1}%
  \quad\rule[-12pt]{2pt}{70pt}\quad
  {\fontsize{60}{60}\selectfont\thesection}}
\titleformat{\section}[block]
  {\filleft\normalfont\sffamily}{}{0pt}{\secformat}
\titlespacing*{\section}{0pt}{*3}{*2}[1pc]
%StopShownPreambleCommands

\begin{document}
\section{A Title\\ on Two Lines}
In this example the heading number appears to
the right of the heading text.
\end{document}