This paper presents a general framework to assess urban rail logistics suitability via a socio-economic cost benefit analysis and demand catchment assessment. First, we examine the main background issues related to data production in urban logistics and the needs of examining the economic viability of future projects. Second, we present methodology proposed that combines a classical CBA framework with a freight catchment analysis framework. Third, as an example of application, we propose to assess freight tramway deployment scenarios in Paris, France. The results show the potential of including demand catchment analysis in CBA to identify the suitable demand introduction strategy. However, it seems important to contextualize them, such methods being used to support decisions and not to substitute decision maker.