Standards on rail spacing for railway works in Vietnam

18:59, 11/07/2024

Recently, the Ministry of Transport (Hanoi, Vietnam) issued Circular 32/2018/TT-BGTVT promulgating 02 national technical regulations on railways.

Depending on the straight track, curved track, newly constructed or in-use railway, there will be different standards for rail spacing. To be specific:

- The rail spacing on a straight track is the shortest distance between the active faces of the two main rails, measured at a point 16 mm below the top of the rail, which is 1000 mm for a 1000 mm gauge track and 1435 mm for a 1435 mm gauge track.

- On curved tracks, the internal spacing between the two rails is specified in Table 1. The variation in spacing shall not exceed 1‰.

Table 1 - Iinner gap between the 2 rails

1000 mm Gauge Track and Nested		1435 mm Gauge Track and Nested
Curvature Radius (m)	Iinner gap between the 2 rails (mm)	Curvature Radius (m)	Iinner gap between the 2 rails (mm)
From 501 and upwards	1000	From 651 and upwards	1435
From 401 to 500	1005	From 650 to 451	1440
From 301 to 400	1010	From 450 to 351	1445
From 201 to 300	1015	From 350 and below	1450
From 200 and below	1020

- For newly constructed, upgraded, or majorly repaired railways, the deviation in the internal spacing between the two rails on both straight and curved tracks compared to the standard should not exceed

+4 mm and not be less than -2 mm for a 1000 mm gauge track, and not exceed

+6 mm and not be less than -2 mm for a 1435 mm gauge track.- For railways in operation, the deviation in the internal spacing between the two rails must comply with the current regulations.

Refer to the provisions on auxiliary equipment in Circular 32/2018/TT-BGTVT which comes into force in Vietnam from July 1, 2018.

- Thanh Lam -

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