BS 4521-3.1:1974

Co-operating organizations
Foreword
Specification
1 Scope
2 Definitions
3 Inspection
4 Identification marking
5 General requirements
6 Nomenclature
7 Materials
8 Dimensions
Appendix
A Partly worn rail
Tables
1 Nomenclature for components
2 Materials for components
3 Leading dimensions of heel switch turnouts in Figs.
    1 and 3
4 Leading dimensions of spring switch turnouts in
    Figs. 2, 4 and 5
Figures
1 Layout diagram for heel switch turnouts
2 Layout diagram for spring switch turnouts
3 Leading dimensions of heel switch turnouts, 1 in
    4 and 1/2, 5, 5 and 1/2, 6, 6 and 1/2, 7, 7 and 1/2,
    8
4 Leading dimensions of spring switch turnouts, 1 in
    4 and 1/2, and 1 in 5
5 Leading dimensions of spring switch turnouts 1 in
    5 and 1/2, 6, 6 and 1/2, 7, 7 and 1/2, 8
6 Heel switches nomenclature
7 Spring switches nomenclature
8 9 ft heel switch (item 443)
9 12 ft heel switch (item 447)
10 20 ft spring switch (item 455) - general arrangement
11 20 ft spring switch (item 455) - details for 1 in 4,
    4 and 1/2, 5, 5 and 1/2, 6, 6 and 1/2, 7, 7 and 1/2
    and 8 turnouts
12 Switch slide chair (item 421)
13 Detail of bolted heel chair (item 419)
14 Back heel chair (item 422)
15 Stretcher bars (items 32, 33) and soleplate (item
    470)
16 Crossing and check rail nomenclature
17 Crossing and check rail for heel switch turnouts, 1
    in 4 and 1/2 and 1 in 5
18 Crossing and check rail for spring switch turnouts,
    1 in 4 and 1/2 and 1 in 5
19 Crossing and check rail for heel and spring switch
    turnouts, 1 in 5 and 1/2 and 1 in 6
20 Crossing and check rail for heel and spring switch
    turnouts, 1 in 6 and 1/2
21 Crossing and check rail for heel and spring switch
    turnouts, 1 in 7, 7 and 1/2, 8
22 Crossing nose chair (item 427)
23 Switch and crossing bolts (item 41)
24 Switch and crossing blocks (items 429, 430)
25 Rail joint fishplated (item 427)
26 Common chair (item 20)
27 Short base common chair (item 23)
28 Crossing chairs (item 26)
29 Crossing and check chairs (items 26, 24, 25)
30 Block slide chairs for spring switches (item 428)
31 Coach screw, fang bolt, ferrule and keys (items 38,
    39, 40)
32 Switch anchor for spring switches (item 71)