BS 4521-1.1:1971

Co-operating organizations
Foreword
Specification
1 Scope
2 Definitions
3 Inspection
4 Identification marking
5 Design and production
6 Nomenclature
7 Materials
8 Dimensions
Appendix
A Partly worn rail
Tables
1 Nomenclature for components
2 Materials for components
3 Leading dimensions of turnouts in Figs. 1, 2 and 3
4 Leading dimensions of turnouts in Fig. 5
Figures
1 Layout diagram for turnouts (1 in 7 and 1/2 L.H.
    turnout shown)
2 Types of turnout, 1 in 7 and 1/2 and 1 in 8
3 Types of turnout, 1 in 9, 1 in 10, 1 in 11 and 1 in
    12
4 Switches, crossing and check rail for L.H. turnout
5 Setting out details for types B and C switches
6 Rail joint (fishplated) (item 7)
7 Coach screw, fang bolt, ferrule and keys, (items 38,
    39 and 40)
8 Common chair S1 (item 20)
9 Short base common chair L1 48LB (item 23)
10 Type B straight cut switches (item 43)
11 Type C straight cut switches (item 48)
12 Switch slide and switch block chairs for types B and
    C switches (items 21 and 22)
13 Details of fittings for switches type B and C (items
    35, 41, 71, 72 and 73)
14 Stretcher bars and steel soleplate (items 32, 33 and
    70)
15 Crossing, 1 in 7 and 1/2 (item 44)
16 Crossing, 1 in 8 and check rail (items 45 and 10)
17 Crossing, 1 in 9 and 1 in 10 (items 46 and 47)
18 Crossing, 1 in 11 and check rail (items 49 and 10)
19 Crossing, 1 in 12 and check rail (items 50 and 10)
20 Crossing nose chair (built-up Type A chair with
    extended nose blocks) (item 27)
21 Crossing and check chairs (items 24, 25 and 26)
22 Crossing chairs (item 26)
23 Switch and crossing bolts and nuts and spring
    washers (item 41)