Railway Workshop Utility Survey for Locomotive Works

What does a railway workshop utility survey find?

It locates the cables, air and water mains, drains and old pits buried across a coach or locomotive works. The drawing lets a new shed, pit line or road go ahead without a strike. Most railway works are large, old and busy. Their underground networks have grown shop by shop, often with records held in separate departments.

The problem is rarely one missing pipe. It is a dozen utility lines of different ages crossing the same strip between two shops, some live, some dead and some never drawn. A ground penetrating radar (GPR) survey sorts them out. Its radar pulses leave the antenna as electromagnetic waves, and every pipe, cable or old pit reflects part of the energy back.

Age makes it harder. Some zonal workshops are more than a century old, and their original drains and pipe runs were laid long before any drawing standard existed. Later shops were added around them, and the old lines were left in place.

Railway workshop survey at a glance

The scope, methods and outputs most workshop surveys involve are summed up below.

For quality-level grading of each service, as some design consultants ask for, read more on SUE survey.

Which production units and workshops does this apply to?

Any coach, locomotive or wagon works, and the zonal repair workshops and sheds that maintain rolling stock. Indian Railways' coach factories are the Integral Coach Factory (ICF) in Chennai, the Rail Coach Factory (RCF) at Kapurthala and the Modern Coach Factory (MCF) at Raebareli. Its locomotive units are Banaras Locomotive Works (BLW) in Varanasi, Chittaranjan Locomotive Works (CLW) in West Bengal and Patiala Locomotive Works (PLW) in Punjab.

The same survey suits periodic overhaul workshops, electric and diesel loco sheds, coaching depots and wagon repair shops. Indian Railways and its production units have placed survey orders with Mezux Touch directly. Contractors working inside these premises engage us for their own packages.

Shed extension and new pit line work

A coach factory cable survey or shed extension survey is needed when a new bay, pit line, washing line or traverser is planned beside working buildings. These zones are crowded. Feeder cables to cranes and welding plant, compressed air headers, lighting circuits and drainage from inspection pits all compete for the same ground.

• Pit lines: we trace the drains and the cables that feed pit lighting and power points, and check the ground where a new pit will be cut.
• Bay extensions: column footings are cleared one by one, with special care where a crane power cable runs along the old wall.
• Traverser and turntable pits: the edges of old pits often hide drains, sump lines and cable ducts laid round them.
• New internal roads: crossings of cable trenches and drains are located so culverts and ducts can be placed before paving.

Our wider rail work, from yards to new lines, is listed under railway projects details.

Which cables are special to railway premises?

Signalling and telecom cables, traction return and earthing connections, and track-side equipment cables need the most care. A cut can affect train movement as well as the shop. Workshop signalling is simpler than on a main line, but sidings, reception lines and test tracks still carry track circuits and point machines.

Where a works has an electrified test track or reception line, earthing and bonding connections run close to the surface beside the rails. We trace these with locators, mark them separately from power cables and keep a clear safe distance from the running line throughout the work.

How do we work inside a railway works?

Under the works' own permit and safety rules, with our crew briefed by the site engineer before any scan and escorted near running lines. Railway premises have strict controls over who may walk near the track and when, and we plan the scan around shunting and crane movements.

1. Permission: the engaging contractor or department arranges the work permit and, near track, any protection required.
2. Records check: we collect what the electrical, signalling and civil sections hold, because each keeps its own drawings.
3. Scan and mark: radar and locator passes across each work zone, with marks made the same day.
4. Confirm with owners: any cable we cannot identify is shown to the relevant section before the drawing is final.

We recommend the same habit of checking with every owner outside railway land. call before you dig in India explained sets it out step by step.

What drawing does the works receive?

A layered drawing on the works grid or the railway's chainage system, with each service type on its own layer and depths at regular points. The file is built from the data collected so the electrical, signalling and civil sections can each switch on only their own layers. To understand the formats and GIS options, read about CAD and GIS utility mapping.

A service schedule comes with the drawing. It has one line for every cable, pipe, chamber and pit, with size, material, depth range and status: live, dead or unknown. Unknown items are listed, so the works can trace them further or protect them during the construction project.

The record is most useful if it keeps growing. After each new shed, its services join the same underground utility mapping file, so the next project starts from a complete picture.

What does a workshop survey cost?

GPR line scanning is billed at ₹24 per metre standard or ₹32 per metre with an L-section, and GST is added on top. Works outside Delhi NCR, which includes all the production units named above, carry a minimum order of ₹1,00,000; sheds and depots inside NCR have a ₹50,000 minimum. Area grids around a new shed are converted to scan length in the written quote, which keeps a small job cost-effective. When several workshops are surveyed under one order, whole-order discounts of 25% above 100 km, 40% above 500 km and 50% above 1,000 km apply. To fix the scope on site, request a site visit with the layout of the area.

Frequently asked questions

Can you scan close to a running siding?

Yes, but only with the protection and escort the works requires. We keep equipment clear of the running line and plan scans around shunting movements.

Do you find old drains from the original works layout?

Often, yes. Old masonry and pipe drains show clearly on radar, which picks up metallic and non-metallic objects alike. We also open accessible chambers to confirm direction and depth.

Who arranges the work permit?

The contractor or railway department that engages us arranges the permit and any track protection. We supply the crew list, method and equipment details they need.

Can you separate signalling cables from power cables?

Yes. We detect and map live cables with locator signals, check them with the signalling and electrical sections, and draw them on separate layers.

How deep are services in a workshop?

Most cables and water pipes in workshops lie within the top one to two metres, though drains near pits can be deeper. Ground conditions set the radar range, and each depth is reported with a tolerance.

Is the survey useful for an asset register?

Yes. Many works use the drawing as the base of their underground asset record and update it after each project.

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