Suberb and very rare image of an old, steam powered, brewery dray. This one was operated by the brewer Thomas Whewell.
Thomas Whewell's Victoria Brewery was on Adelaide Street, which was in the Montague Street / Wensley Fold area. That is very probably the gateway to the brewery they are stood outside.
Judging by the clothes, I would date this photo to the 1920's.
PHOTO COURTESY OF THE COMMUNITY STUDIES DEPT. BLACKBURN LIBRARY.