The division between the records of the Amalgamated Society of Railway Servants of England, Ireland, Scotland and Wales and those of its successor, the National Union of Railwaymen, is not entirely clear cut. A number of files and minute books span both organisations. In all cases such items are listed as a part of the National Union of Railwaymen archive and cross references are provided.
The following points should be noted:
all records of branches of the Amalgamated Society of Railway Servants of England, Ireland, Scotland and Wales are listed as National Union of Railwaymen records at MSS.127/NU/6/BR1-22;
records of the Conciliation Boards established after the 1907 dispute are listed as records of the National Union of Railwaymen's Movements Department under reference MSS.127/NU/MV1;
publications of bodies other than the National Union of Railwaymen and its predecessors (including the Amalgamated Society of Railway Servants of England, Ireland, Scotland and Wales) are listed under reference MSS.127/NU/5/1-5.