\begin
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%\documentclass[BTech]{iitddiss}
\documentclass[PhD]{iitddiss}
%\documentclass[MS]{iitddiss}
% \documentclass[MTech]{iitddiss}
% \documentclass[Dual]{iitddiss}
% \documentclass[Other]{iitddiss}
% IF YOU USE THE OTHER OPTION, THEN YOU MUST FILL OUT THE PROGRAM OPTION BELOW TOO
%\program{My Fancy Degree}
% \usepackage{times}
\usepackage{t1enc}
\usepackage{graphicx}
\usepackage[hidelinks]{hyperref} % hyperlinks for references.
\usepackage{amsmath} % easier math formulae, align, subequations \ldots
\usepackage[english]{babel}
\usepackage[utf8]{inputenc,xcolor}
\usepackage[round]{natbib}
\addto\captionsenglish{\renewcommand{\bibname}{References}}
\usepackage{listings}
\usepackage{color}
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language=Fortran,
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columns=flexible,
basicstyle={\small\ttfamily},
numbers=none,
numberstyle=\tiny\color{gray},
keywordstyle=\color{blue},
commentstyle=\color{dkgreen},
stringstyle=\color{mauve},
breaklines=true,
breakatwhitespace=true,
tabsize=2
}
\usepackage{longtable}
\usepackage{multicol}
\usepackage{multirow}
\usepackage{comment}
\usepackage{etoolbox} % <--- added
\AtBeginEnvironment{enumerate}{\linespread{1.5}\selectfont}% <--- added
\AtBeginEnvironment{itemize}{\linespread{1.5}\selectfont}% <--- added
\usepackage{enumitem}
\usepackage{datetime}
\newdateformat{monthyeardate}{%
\monthname[\THEMONTH], \THEYEAR}
\usepackage{sectsty}
\sectionfont{\fontsize{12}{15}\selectfont}
\subsectionfont{\fontsize{12}{15}\selectfont}
\usepackage{titlesec}
\titleformat{\chapter}[display]{\bfseries\centering}{\Large Chapter \thechapter}{1em}{\Large}
%\titlespacing*{\chapter}{0pt}{0pt}{0pt}
\usepackage{caption}
\captionsetup[table]{font={stretch=1.2}} %% change 1.2 as you like
\captionsetup[figure]{font={stretch=1.2}}
\usepackage{fancyhdr}
\linespread{2}
\pagestyle{fancy}
\renewcommand{\sectionmark}[1]{\markright{\thesection\ #1}}
\fancyhf{}
\rhead{\fancyplain{}{\thepage}} % predefined ()
\lhead{\fancyplain{}{\rightmark}} % 1. sectionname, 1.1 subsection name etc
%\cfoot{\textcopyright \text{ } \the\year, \emph{Indian Institute of Technology Delhi}}
\renewcommand{\footrulewidth}{0.4pt}
\usepackage{subfiles}
%\providecommand{\main}{.} % relative path to master.tex
%\providecommand{\cwd}{.} % path of the current directory wrt master
\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Title page
\title{Some thesis title on rail tracks}
\author{Test Guy}
\advisor{Prof. Some Name, IIT Delhi\\
Prof. Some Name1, IIT Kanpur }
\entrynumber{2022CEZ3242}
\department{Civil Engineering}
%\nocite{*}
\maketitle
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Non-Content pages
\input{nonindex/certificate}% Certificate
\input{nonindex/acknowledgements}% Acknowledgements
%\includepdf[pages=-]{nonindex/hindi_abstract.pdf}
\input{nonindex/abstract}
\input{nonindex/abstract_hindi}% Acknowledgements
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Table of contents etc.
\begin{singlespace}
\tableofcontents
\thispagestyle{empty}
\listoffigures
\addcontentsline{toc}{chapter}{List of figures}
\listoftables
\addcontentsline{toc}{chapter}{List of tables}
\end{singlespace}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%\input{nonindex/abrv}% Abbreviations
\input{nonindex/notations}% Notations
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pagebreak
\clearpage
% The main text will follow from this point so set the page numbering
% to arabic from here on.
\pagenumbering{arabic}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Introduction.
\include{all_chapters}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Appendices.
%\appendix
%\chapter{VDLOAD fortran subroutine for ML case}
%\input{parts/appnd/apnd_1}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Bibliography.
\begin{singlespace}
\bibliographystyle{plainnat}
\bibliography{refer.bib}
\addcontentsline{toc}{chapter}{References}
%\newpage
%\input{nonindex/biodata}
\end{singlespace}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% List of papers
\begin{singlespace}
\input{parts/papers/papers}
\end{singlespace}
\end{document}