The isothermal magnetization hysteresis loops were measured forTl2Ba2CuO6 (Tl-2201) single crystals by using a SQUID magnetometer and a micro Hall sensor.In the temperature window from 15 to 30 K, the Hall sensor measurements forM(B) showed a second magnetization peak (SMP) at a peak field,Bsp, and anonset field, Bon. In this temperature region, the second peak appeared as a shoulder in theM(H) plots whenmeasured by using SQUID. At a temperature of 20 K, time relaxation measurements for the time intervalof 1–104 s were carried out at different fields by using a Hall sensor. From theserelaxation data, for both flux exit and entry, the activation barrier,U0, and the creepexponent, μ, were separately calculated as a function of local field,Bz, by using the weak collective pinning theory. The variation ofμ, andU0 as afunction B indicates that below the onset of the second peak field,Bon, the creepmechanism is an elastic process, but above it, a gradual transition to plastic creep takes place. At higherfields, μ and U0 reduce sharply. This has been interpreted as a smooth transition to a 2D collective pinningstate. These results are compared with that obtained in a double layer Tl compound,Tl2Ba2CaCu2O8 (Tl-2212),aswell as other high-Tc materials.