Rail wheel system and rail-road car

The invention relates to a rail wheel system and a rail-road car. The rail wheel system comprises a guide rail base, a fixing structure, an adjusting structure and a driving structure. The guide rail seat is provided with two driving arms, each driving arm is provided with a track wheel, and each driving arm is movably arranged in the direction close to and away from the other driving arm; the fixing structure comprises a fixing plate and a connecting arm, one end of the connecting arm is movably arranged on the fixing plate, and the other end is connected to the guide rail seat; the adjusting structure comprises a first adjusting part arranged on the guide rail seat and a second adjusting part arranged on the fixing plate, the first adjusting part is in driving connection with the driving arms, and the second adjusting part is in driving connection with the connecting arm and used for driving the connecting arm to move; the driving structure comprises two driving parts arranged in one-to-one correspondence w