I think that Horbury Millfield Road would have preceded that...but to continue.....Horbury Junction
Notton and Royston
Noting that to get from Horbury Junction to Hare Park and Ossett would have needed two reversals, at Wakefield Kirkgate and Wakefield Westgate. I am rather glad about that because in checking whether there was a more direct connection, I found out about Smithson's Tramway dating from 1798, which crossed both routes on its way from Low Laithes Colliery to a wharf on the River Calder.
Indeed there was.A GENERAL QUERY
From Meadow Hall and Wincobank on the SYR Blackburn Valley Line, was there not a connection line to the Sheffield and Rotherham Railway that led directly to Brightside?