A booster drive (4; 20; 40) for displacing a passenger vehicle along a vehicle track of an amusement ride, the booster drive (4; 20; 40) comprising: - two booster wheels (11; 21; 41), which two booster wheels are configured for each engaging a side of a longitudinal fin mounted on the passenger vehicle such that the fin is pinched between the booster wheels and the passenger vehicle can be displaced along the vehicle track by driving one or both booster wheels, - at least one booster drive motor (12; 22; 42), which at least one booster drive motor is configured to drive at least one of the two booster wheels, - a base (13; 23; 43), the base having a left side and a right side, which base is to be mounted to a vehicle track structure of the vehicle track; - a frame (14; 24; 44), the frame having a left side and a right side, which frame supports the at least one booster drive motor and the two booster wheels; and - a mobile carrier (15; 25; 45), which mobile carrier connects the frame to the base, and which mobile carrier has at least one left carrier arm (16; 26; 46) connecting the left side of the base to the left side of the frame and at least one right carrier arm (17; 27; 47) connecting the right side of the base (13; 23; 43) to the right side of the frame (14; 24; 44), wherein the at least one left carrier arm and the at least one right carrier arm each are flexible arms, which flexible arms are with their ends fixed to the base and to the frame, such that displacement of the frame relative to the base is achieved by flexing of the arms, such that in use the at least one left carrier arm (16; 26; 46) and the at least one right carrier arm (17; 27; 47) enable movement of the frame (14; 24; 44) relative to the base (13; 23; 43) in a direction substantially parallel to a support surface defined by the vehicle track while preventing substantial movement in a direction perpendicular to said support surface, and - a biasing device, which biasing device resiliently forces the frame (14; 24; 44) towards a predetermined position, wherein the booster drive (4; 20; 40) is adapted to be mounted to the vehicle track such that the booster wheels (11; 21; 41) are positioned for pinching between them the longitudinal drive fin of the passenger vehicle when it passes the booster drive (4; 20; 44), and the mobile carrier (15; 25; 45) of the booster drive (4; 20; 40) allows for lateral movement, i.e. movement to the left and/or right, of the longitudinal drive fin relative to the base (13; 23; 43) of the booster drive (4; 20; 40), while the longitudinal drive fin is pinched between the booster wheels (11; 21; 41). - two booster wheels (11; 21; 41), which two booster wheels are configured for each engaging a side of a longitudinal fin mounted on the passenger vehicle such that the fin is pinched between the booster wheels and the passenger vehicle can be displaced along the vehicle track by driving one or both booster wheels, - at least one booster drive motor (12; 22; 42), which at least one booster drive motor is configured to drive at least one of the two booster wheels, - a base (13; 23; 43), the base having a left side and a right side, which base is to be mounted to a vehicle track structure of the vehicle track; - a frame (14; 24; 44), the frame having a left side and a right side, which frame supports the at least one booster drive motor and the two booster wheels; and - a mobile carrier (15; 25; 45), which mobile carrier connects the frame to the base, and which mobile carrier has at least one left carrier arm (16; 26; 46) connecting the left side of the base to the left side of the frame and at least one right carrier arm (17; 27; 47) connecting the right side of the base (13; 23; 43) to the right side of the frame (14; 24; 44), wherein the at least one left carrier arm and the at least one right carrier arm each are flexible arms, which flexible arms are with their ends fixed to the base and to the frame, such that displacement of the frame relative to the base is achieved by flexing of the arms, such that in use the at least one left carrier arm (16; 26; 46) and the at least one right carrier arm (17; 27; 47) enable movement of the frame (14; 24; 44) relative to the base (13; 23; 43) in a direction substantially parallel to a support surface defined by the vehicle track while preventing substantial movement in a direction perpendicular to said support surface, and - a biasing device, which biasing device resiliently forces the frame (14; 24; 44) towards a predetermined position,