AbstractIn previous studies of train‐bridge interactions, impact percentages for member forces have been obtained by use of a pin‐connected truss model and for both member forces and moments by use of a rigid joint truss model. The purpose of this study is three‐fold: (a) to investigate if improved results can be obtained by use of semirigid connections at the ends of the floor beams and stringers; (b) to develop partial bridge models, for studying impacts and the range of forces and moments in members subjected to fatigue; (c) to employ a partial bridge model to study the influences of various factors on the impact factors and stress ranges of the various members and connections of the truss bridge. Descriptions of the bridge and vehicle models and the associated equations of motion are briefly stated, and results from the various bridge models are com