law: Railways Act, 1989
  133. Grant of periodical rest.  
  (1) Subject to the provisions of this section, a railway
  
  servant- 
  (a) whose employment is intensive or
  
  continuous shall, for every week commencing on a Sunday, be granted a rest of
  
  not less than thirty consecutive hours;
  (b) whose employment is essentially
  
  intermittent shall for every week commencing on a Sunday, be granted a rest of not
  
  less than twenty-four consecutive hours including a full night.
  (2) Notwithstanding anything contained in sub-section (1),- 
  (i) any locomotive or traffic running staff
  
  shall be granted, each mouth, a rest of at least four periods of not less than
  
  thirty consecutive hours each or at least five periods of not less than
  
  twenty-two consecutive hours each, including a full night;
  (ii) the Central Government may, by rules,
  
  specify the railway servants to whom periods of rest on scales less than those
  
  laid down under sub-section (1) may be granted and the periods thereof.
  (3) Subject to such rules as may be made in this behalf, if the
  
  prescribed authority is of the opinion that such circumstances as are referred
  
  to in sub-section (4) of section 132 are present it may exempt any railway
  
  servant from the provisions of sub-section (1) or clause (i) of sub-section
  
  (2):
  Provided  that a railway servant so exempted shall, in
  
  such circumstances as may be prescribed, be granted compensatory periods of
  
  rest for the periods he has foregone.