[en] Beam line 4B at TRIUMF has been modified to allow production of polarized proton beams of all polarization components (normal, sideways and longitudinal). This was achieved by the installation of two 2.4 T m superconducting solenoids in the cyclotron vault section of the beam line. It was also required to be able to rotate one vault quadrupole. It was found that for longitudinal polarization in beam line 4B the twister could no longer be operated as a unit section. The standard achromatic and dispersed modes of operation of beam lines 4A and 4B are still available. (orig.)