Railway Crossing Survey for HDD Bores, Pipes and Cables

What does a railway crossing survey have to show?

The track and its formation exactly, the railway land on both sides, and everything buried or standing near the bore at the crossing chainage. Railway engineers review crossings carefully because settlement under the track is a safety issue, not only a repair bill. A clear drawing shortens that review.

The drawing set includes:

• Plan of the crossing area with track centre lines, kilometre post and chainage reference.
• Rail top levels of each track at the crossing and at intervals either side.
• Embankment or cutting cross-section, with formation, toe of bank, cess and side drains.
• Railway boundary pillars or fencing, and the position of launch and receiving pits outside it.
• Signalling and telecom cables, overhead equipment (OHE) mast foundations, culverts and other structures nearby.
• The proposed bore or casing pipe shown in section, with depths below rail and below formation.

Depth, casing material and approval conditions are set by the zonal railway's engineering department. Our job is to put the existing ground and structures beyond doubt.

What sits beside a railway track that a bore can hit?

Mostly cables you cannot see and foundations you can. Signalling and telecom cables lie along the cess or in troughs near the track, and electrified sections have OHE masts on concrete foundations. Point machines, culverts, an old station water line and third-party cables laid years ago may also be present, more so near a level crossing or station yard.

A cut railway cable can stop trains, so the stakes exceed those on a city road. Utility locating runs on both sides of the bore line from the permitted safe distance. It pairs a cable locator with ground penetrating radar, which images buried objects from reflected radio pulses. Railway staff decide when and where we may work closer.

How is the field work done near a running line?

Under the railway's supervision, with track work limited to what their permission allows. We follow the sequence below on most crossings.

1. Permission and escort: the project obtains entry permission, and the section engineer nominates staff to accompany the crew on railway land.
2. Control: DGPS points outside railway land on both sides are carried in by total station, tying the crossing to your route survey.
3. Levels: rail top levels are taken by auto level on a loop closing within about ±2.5 mm per km on a benchmark.
4. Section: total station picks the embankment, cess, drains, fencing and boundary pillars on the crossing line and parallel sections.
5. Utility scan: radar and locator along and across the bore line, the pit areas and any access road, covering existing utility lines.
6. Structures: nearby OHE masts, culverts, signal posts and level crossing equipment, with offsets from the crossing line.

Pit positions sit outside the railway boundary wherever possible. The land beyond the fence is often a road verge or private plot, so read: HDD route survey for how we check the approaches and pipe-string space on that side.

Which documents go with the crossing proposal?

The survey drawings are one part of a package that the project assembles for the zonal railway. Railways differ in the exact list, so ask the division early. A typical package contains:

• Key plan showing the crossing relative to the nearest station and km post.
• Signed and dated plan and cross-section drawings from the survey.
• Casing or carrier pipe design and bore profile, by your design engineer.
• Drilling method statement and safety plan from the HDD contractor.
• Undertakings and fees, handled by the project owner.

Before any pit is opened, even outside the fence, follow the steps in call before you dig in India explained; road verges near railway land often carry other underground utilities.

Why do crossing proposals come back with queries?

Mostly because the drawing leaves the reviewer guessing about the ground. The common queries are predictable, and each can be closed before submission:

• No km post reference: A crossing given only in latitude and longitude makes the division locate it. We tie it to the nearest km post with chainage.
• Levels on an unknown datum: Rail levels mean little without a named benchmark, so the level book and closure are handed over.
• Drains missing from the section: Side and catch-water drains govern water around the bank, and reviewers check that pits avoid them.
• Masts and culverts not dimensioned: Offsets to the nearest OHE mast or culvert should be measured, not sketched.
• Single track assumed: If a future line or siding is planned, the division may ask the bore to clear it; the survey can include the extra width.

Each miss costs a round of correspondence; a complete first submission is the fastest route to a decision.

Deliverables at a glance

Table note: when the crossing is part of a longer route that also needs plot boundaries or alignment checks, see how land survey services works for the land side.

Rates and timing

Scanning follows our GPR rate card and the levelling and section work follows our survey rates.

• GPR scan: ₹24 per metre standard, ₹32 per metre where an L-section is drawn; minimum order ₹50,000 in Delhi NCR, ₹1,00,000 elsewhere.
• Route control: ₹3,000 per DGPS control point.
• Survey crew for levels and sections: ₹8,000 per crew-day.
• Programmes with many crossings: GPR order discounts of 25% above 100 km, 40% above 500 km, 50% above 1,000 km.

Rates exclude GST, and a written quote fixes the total. A double-line crossing takes one field day once escort staff are free, with drawings within three working days. An NCR crossing gets a crew the same day or within 1 working day; elsewhere, the team member living nearest starts at once, one working day later at most. For the finished pipe record, our Mezux as built survey covers both pits and the drilled profile.

Mezux Touch takes direct orders from Indian Railways, and from the project owners whose lines cross its tracks. To plan a crossing, get expert advice on your site with the route map and the nearest km post.

Frequently asked questions

Do you apply to the railway for permission?

No, the project owner applies. We prepare the survey drawings that form part of the application.

Can you survey without a railway escort?

Inside railway land we work only with the permission and supervision the division provides. Outside the boundary we can work independently.

How are depths measured?

From rail top and from formation, both shown on the section, because railways commonly state requirements against one or the other.

What file formats do you hand over?

DWG and PDF drawings plus Excel coordinates and utility data; our GPR survey deliverables guide shows how scan results are drawn.

Can GPR scan right across the track?

Ballast, sleepers and rails limit radar on the track itself, so we scan the cess, slopes and pit areas and rely on utility records and structure picks under the track.

Do you also handle road and canal crossings?

Yes, the same team surveys road, canal and river crossings with the method adapted to each.

Written by Saniya Parveen · Technically reviewed by Rahul Rai · Updated 8 November 2026