What are the different classes of level crossings?

Level crossings are classified as Special, 'A', 'B', 'C', and 'D' Class, based on Train Vehicle Units (TVU) and other specific conditions as per Clause 3 and Table 1.

What is the steepest permissible gradient for a road approaching a level crossing?

The gradient of road approaches shall not be steeper than 1 in 30 (Clause 6.1).

What is the minimum angle at which a road can cross a railway track?

The road should cross the railway line at an angle not less than 45 degrees, though a right angle (90 degrees) is preferred (Clause 5.2).

What is the basis for classifying level crossings?

The primary basis is the 'Train Vehicle Units' (TVU), calculated by multiplying the number of trains per day by the number of road vehicles per day over a given period (Clause 3.1).

IS 7634 Part 1

: 1974

Code of Practice for Level Crossings: Part 1 General Requirements

CurrentSpecializedCode of PracticeBIMTransportation · Railway Engineering

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This standard outlines the general requirements for the design, classification, and safety equipment of railway level crossings. It categorizes crossings based on traffic density (Train Vehicle Units) and specifies standards for siting, road approaches, gates, and visibility to ensure public safety at the intersection of road and rail lines.

Specifies general requirements for the design, construction, and maintenance of railway level crossings.

Quick Reference Values

Minimum angle of road and railway intersection45 degrees

Preferred angle of road and railway intersection90 degrees

Maximum road approach gradient1 in 30

Minimum width of carriageway at level crossing5.5 m

Standard height of gate post above road level1.2 m

Minimum distance of gate post from centre line of nearest track3 m

Practical Notes

The classification of a level crossing (Special, A, B, C, D) based on Train Vehicle Units (TVU) is the most critical aspect, as it dictates all subsequent safety and equipment requirements.

While this IS code is a foundational document, always consult the latest Indian Railways Permanent Way Manual (IRPWM) and directives from the respective Zonal Railway, which often supersede or supplement these guidelines.

Ensure strict adherence to the visibility requirements (sighting triangle) for both road users and the train driver, as this is a primary factor in preventing accidents.