Layout of Turnout

To lay out a turnout in the field, the values of offsets from the gauge face of the straight track to the gauge face of the turnout may be adopted from Table 14.6.

Table 14.6 Laying turnouts in the field*

Distance from heel

Offset f

1 in 8.5 4725-mm straight (ST) switch

rom gauge f

1 in 12 6400-mm ST switch

ace of straigh

1 in 12 7730-mm curved switch

it track to g

1 in 8.5 4115-m ST

switch

auge face of

1 in 12 5485-mm ST

switch

turnout

1 in 12 6700-mm curved switch

3000

-

-

241

-

-

4500

-

-

-

330

-

-

6000

382

293

322

437

313

362

7500

469

365

381

564

386

445

9000

565

403

445

709

468

537

10,500

672

466

515

-

559

638

12,000

790

512

589

-

659

747

13,500

917

606

668

-

769

-

15,000

1055

685

752

-

-

-

16,500

1202

767

841

-

-

-

(contd)

Distance

Offset from gauge face of straight track to gauge face of turnout

from heel

1 in 8.5 4725-mm ST

switch

1 in 12 6400-mm ST switch

1 in 12 7730-mm curved switch

1 in 8.5 4115-m

ST

switch

1 in 12 5485-mm ST

switch

1 in 12 6700-mm curved switch

18,000

856

935

-

-

-

19,500

-

950

1033

-

-

-

21,000

-

1047

1137

-

-

-

22,500

-

1151

1246

-

-

-

24,000

-

1260

1359

-

-

-

Total number

51

70

70

37

47

47

of sleepers

Switch angle

134'27"

18'0''

027'35''

135'30''

19'38''

024'27''

Crossing

642'35"

445'49''

445'49''

642'49''

445'49''

445'49''

angle

Drg. no.

TA

TA

TA

TA

TA

TA

20,104

and

20,804

5268(M)

and

20,801

20,171

and

21,831

20,171

and

21,004

20,401

and

20,001

20,484

* All dimensions are in millimetres.

Turnout with Curved Switches | RAILWAY ENGINEERING | Trends in Turnout Design on Indian Railways