I know that I immediately have the attention of one TDU reader (...Hi Ron!)
When New Preston deopt / workshops was re-developed in recent years two of the buildings were named after former MMTB chairmen - Hector Bell and Robert Risson.
Alexander Cameron, who was chairman when the workshops were planned and built, missed out.
However, his contribution is noted in a large plaque attached to the wall of the HH Bell building.
Pic attached.
The other man in the pic is the MMTB architect, A G Monsborough.
Mal Rowe - who thinks the pic was made at Wattle Park alongside one of the cable grips used as picnic shelters there.