1600/R
1700/R
1750/R
1850/R
the gauge face of the stock rail and tongue rail
the outer face of the stock rail and tongue rail
the gauge face of the stock rail and outer face of the tongue rail
the outer face of the stock rail and the gauge face of the tongue rail
(i) and (ii)
(ii) and (iii)
(iii) and (iv)
(i)and(iv)
89 mm
95 mm
100 mm
115 mm
to permit lateral movement of the tongue rail
to maintain the two tongue rails at the exact distance
to ensure exact gauge at the toe of the switch as well as the nose of crossing
to prevent any vertical movement between the wing rail and nose of crossing