British Railways has developed two new switches in 109-lb. f.b. rail. They are the "Curved F" and "G" switches and are both of the chamfered type, which, by the undercutting of the stock rail, permits the retention of sufficient metal in the switch rail to provide the robust section desirable at and near the switch toe when very fine entry angles are used. In the Southern Region a speed restriction of 50 mph is considered suitable for Curved F switches diverging from the straight. G switches will be used where higher speed restrictions up to 75 mph from straight are required and site conditions permit. Layout drawings for a double junction embodying G/24 turnouts have been completed. By the use of two-level baseplates and transition curves as necessary, a practially constant cant deficiency of just over 2-1/2 in. at 75 mph is possible.

  • Corporate Authors:

    Temple Press Limited

    161-166 Fleet Street
    Longon EC4,   England 
  • Publication Date: 1957-9-20

Media Info

  • Features: Photos; Tables;
  • Pagination: p. 333-334
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00037648
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 4 1994 12:00AM