Railway servants (hours of labour). Return in pursuance of section 4 of the Regulation of Railways Act, 1889, of railway servants of certain classes who were on one or more occasions during the month of May, 1911, on duty on certain railways of the United Kingdom for more than twelve hours at a time, or who, after being on duty more than twelve hours, were allowed to resume work with less than nine hours' rest (showing periods of duty after deduction of time, if any, spent in travelling home after relief, and of certain definite and continuous intervals of rest of four hours or upwards); with appendices giving additional statements and explanations furnished by the railway companies [electronic resource].