There is definitely a Castleford Rugby Union Club[1][failed verification] in existence long before the Great Schism,[2] and they played in the old Yorkshire Cup competition, winning "T’owd tin pot" once and finishing runners up once before 1900.
For this second season, eight new teams joined the league: Bramley, Castleford, Heckmondwike, Holbeck, Leeds Parish Church, Morecambe, Swinton, and Salford.
But things were different in the end of season Challenge Cup competition, where, on 13 April 1901 on a neutral ground, Castleford reached the semi-final stage where they lost to Warrington by 21–5.
[3] At the end of the season the top seven sides from both the Lancashire and the Yorkshire Senior in the 1900–01 competitions of the NRFU, resigned and merged into a new league for 1901–02.
At the end of the 1901–02 season, the County Leagues elected 18 teams to join the new Division 2 (7 from Lancashire and 10 from Yorkshire and a new member from South Shields) with the existing second competition scrapped.
A new Northern Union club was formed in late December 1909, from a meeting held at the Garden House Hotel.
[4] They decided to enter the Yorkshire Junior NU Cup and commenced with an ordinary engagement with York on 1 January 1910 which resulted in a 22–5 defeat.
One item of note, in the 1913–14 season, on Saturday 28 February in the Challenge Cup 1st Round, Wigan travelled to a Castleford team and beat them 27–8.
Many official records[7] state that they were founded at this time (June 1926), but they had played successfully in the lower Yorkshire County leagues for several years before this date.