Railway lines consist of steel truss bridges which are very old and have many problems due to inadequate maintenance system or need to increase its capacity to carry higher loads. To undertake above challenges there should be proper procedure to evaluate these bridges. This paper represents methodology for condition assessment and retrofit existing railway bridges. It start from basic condition assessment and runs up to developing detailed numerical model and at the end suitable methods is proposed to retrofit the bridge to full fill the requirements. All major steps were briefly described and all other important facts are mentioned
