Looking at the shadows cast bgy the horses in the picture, I rather think the photo was taken against the sun (not that it was a sunny day), so that the tram would have been going north along Nechells Park Road. The houses in the right background have shallow front gardens, and afdter looking at the Alan Godfrey's copies of the 1904 OS map, I think it was at the terminus of the horse line, where Needham Street branches to the left (off the picture). It took 3 whole months to rebuild the tracks, which was necessary for electric cars, and they were extended to form a loop, which left Nechells Green by Long Acre, then turned right into Cuckoo Road and returned via Nechells Park Road. The electric cars first ran on 01.01.1907.
Peter