1 & 2. Halle 902 and Leeds 602 have been moved to Depot V where they are standing side by side. I think they represent interesting derivations from the American PCC design. 602 remained a 'one off' prototype whereas Tatra T3s and T4s were manufactured in their thousands and many are still in service today.
3. Glasgow 22 and J'burg 60 were the two service trams today.