Customer satisfaction is a key factor for the successful long-term survival of any company in the market and equally it can be seen as a competitive advantage. Therefore, it is necessary for the company to regularly monitor customer satisfaction. The presented paper contains a comparison of the Railway Company Cargo Slovakia with competing transport companies. It includes evaluation of the marketing research oriented towards degree of customer satisfaction with individual services aspects of the company. Based on the research, it was found that overall customer satisfaction is at an average level. Among the areas with which customers are least satisfied include the transport time, transport reliability and solving problems during transport. Conversely, customers are mostly satisfied with providing information, service offer and additional services. Part of the paper is the SWOT analysis of the Railway Company Cargo Slovakia. Although the company declares its effort to approximation to the customer, this effort is not always sufficiently visible also in practical company activities. In the current market environment, the key importance of customers is undeniable for long-term successful survival of the company in the market. Therefore it is necessary for the company to keep seeking not only attracting new customers, but especially the maintenance and strengthening of cooperation with existing company customers. In conclusion of the article, there are indicated proposals to increase customer satisfaction with services of the Railway Company Cargo Slovakia and to increase the competitiveness of the company.