The　cracking　of　simply　supported　prestressed　concrete　(PC)　T-beams　in　heavy-haul　railways　under　the　long-term　action　of　heavy-axle　weight　and　high-frequency　train　load　have　frequently　occurred　and　severely　affected　the　durability　of　bridges.　To　explore　the　reliability　of　cracking　resistance　in　simply　supported　PC　T-beams　during　the　service　of　heavy-haul　railway,　research　on　time-dependent　reliability　of　crack　resistance　in　normal　and　inclined　sections　was　conducted.　First,　considering　the　fatigue-induced　prestress　loss　and　time-dependent　characteristic,　the　limit　state　functions　for　crack　resistance　of　normal　and　inclined　sections　were　established.　Second,　the　effect　of　train　load　was　analyzed,　and　the　fatigue-induced　prestress　loss　model　related　to　load　history　was　established.　Next,　statistical　information　of　concrete　tensile　limit　strength,　instantaneous　prestress　loss,　first-stage　and　second-stage　dead　loads,　and　train　load　were　summarized　based　on　literature　review.　Finally,　based　on　PHI2　method,　the　time-dependent　reliability　analysis　for　crack-resistance　of　simply　supported　PC　T-beams　of　a　heavy-haul　railway　and　parametric　analysis　were　carried　out.　The　results　indicate　that　under　the　same　train　axle　load,　the　reliability　index　of　crack　resistance　in　inclined　section　is　lower　than　that　in　normal　section,　the　adverse　effect　of　increasing　train　axle　weight　on　crack-resistance　reliability　of　inclined　section　is　greater　than　that　of　normal　section;　the　effect　of　the　train　axle　weight　on　crack-resistance　reliability　is　much　larger　than　the　daily　train　frequency;　with　the　same　annual　freight　volume,　the　combination　of　small　axle　weight　and　high　daily　train　frequency　corresponds　to　a　higher　crack-resistance　reliability;　the　influence　of　instantaneous　prestress　loss　on　crack-resistance　reliability　of　normal　section　is　stronger　than　that　of　inclined　section;　and　the　mean　value　of　the　load　parameter　has　a　greater　impact　on　the　reliability　index　than　the　coefficient　of　variation.　This　study　can　provide　reference　for　the　design,　maintenance　and　repair　of　heavy-haul　railway　PC　simply　supported　T-beams.　©　2025,　Central　South　University　Press.　All　rights　reserved.