Sociohygienic monitoring on the railway transport, which is a branch part of the state sociohygienic monitoring system, includes observation, analysis, assessment, and prediction of the health status and habitat of railway workers and population to be served, as well as the establishment of associations of the health status with environmental factors. Standard legal, scientific-and-methodological, and organizational bases have been set up for branch monitoring. The basic parameters and the procedure for interaction of branch and territorial entities have been defined.