Warren Doubleday is the archivits at Ballarat Tramways Museum.
He has provided the answers below regarding the pic of Ballarat 29 that Andrew Cook sent to TDU:
Noted the comments about Ballarat 29 on tdu. Some more information.
The photo of 29 is by Wal Jack. The Ballarat Tramway Museum holds the negative. On the back on a print, Wal has written:
"No. 29 1st day out after being renumbered from No. 22, Wendouree Parade (Carlton St Loop), 4-11-38."
The man would be checking for hot axle bearings as we still do after a tram's first trip. The box on the tram is still a mystery - cropped image attached - more thoughts welcome. Wal does not mention in his notes on No. 29 of any use as a track cleaner.