The monocentric model is extended by considering a discrete number of accessible mass transit stations. Households combine two modes for their daily home-to-work trip: a first mode for terminal access to stations and a second (long-haul) mode that consists of radial mass transit axes. The urban equilibrium, that is, city size and household distribution, is derived as a function of the mass transit network and the distribution of land housing capacity. At the urban equilibrium, the land rent peaks at transit stations and decreases with the travel cost from the city center, rather than with the distance to it. Accordingly, the housing lot size increases with the travel cost from the city center. These features distinguish this framework from previous monocentric models. The analysis is based on the assumptions that land owners are absent and the city is open (households’ level of utility is given and the population size is endogenous). For numerical illustration, the model is calibrated to a selected rail network in the Paris area. A sensitivity analysis of the urban structure and land use equilibrium is conducted, with key model parameters.