I think you will find the underground car park idea was scrapped just before the whole Congestion Charge scheme was voted out by more than 4 to 1.
Most of the extensions to the tram network are going ahead anyway, the money had already been allocated for that. It is things like a bus lane along the East Lancashire Road (A580) that are not going ahead.
Despite the result, some of the councillors have now gone on record as saying this plan was too important and should not have been subjected to a democratic vote!! Too bad, I think a few more who supported the scheme will be voted out oo office at the next election.