This paper provides an empirical analysis of the determinants of service prices and frequencies of conventional high-speed rail (HSR) in France. We use original data for the period 09/2019-03/2020 and consider the intensity of intermodal competition and the diversification strategy of the incumbent rail operator. The main econometric results show that the determinants of the price per kilometer of conventional HSR services (1st and 2nd class) are partly common (especially for the variables explaining the technical characteristics of the routes and the alternative offer) and partly specific (competitive environment, economic and demographic environment). Frequencies depend mainly on travel time. On the routes for which the conventional HSR does not provide a quality service (frequency and/or price), a complementary alternative offer compensates the low frequency of conventional HSR services.