The main train station is located south of the Old Town, and is not far from Park Ludowy – only 7 minutes by foot.
National rail carrier PKP Intercity provides service to Lublin from most other major Polish cities, including Warsaw, Wrocław, Kraków, Poznań, Katowice, Łódź and Gdańsk. The train journey from Warsaw to Lublin normally takes 2.5 hours.
The ticket can be purchased at least 30 days earlier, but no later than 15 minutes before the time of departure.
Here is some information which may be useful for you: PKP Intercity FAQ.
In addition, national regional carrier PolRegio operates to smaller cities and communities throughout Lublin Voivodeship, as well as connecting the city to other larger municipalities throughout the country, albeit with slower speeds and more stops.