Railway Drone Inspection Checklist & Requirements (EU and US, 2026)

A railway drone inspection programme is ready to fly when five things are settled: an aviation approval that matches how you will fly, the infrastructure manager's rules for working on or near the line, a sensor package matched to each asset, an operating model, and a data plan that gets findings into maintenance and respects privacy. In Europe the aviation side runs through Regulation (EU) 2019/947, and corridor work almost always lands in the "specific" category; in the United States it runs through Part 107 plus a waiver for beyond-visual-line-of-sight (BVLOS) flights, with the proposed Part 108 still pending. The checklist below covers each item, with the EU and US basis.

Disclosure: Dronehub builds drone-in-a-box infrastructure and an in-house AI inspection stack built for linear assets such as rail corridors. We have kept this checklist vendor-neutral and say so where our own product comes up.

The checklist at a glance

Regulatory basis in Europe

Open, specific or certified

Regulation (EU) 2019/947 sorts every drone operation into the open, specific or certified category. The open category needs no authorisation but requires visual line of sight, a height of 120 m or less and an aircraft under 25 kg; the specific category requires an operational authorisation from the national aviation authority, or a declaration against a standard scenario.

Railway inspection almost always ends up in the specific category: useful corridor work happens beyond visual line of sight, and national rules keep open-category drones off the track. ProRail, the Dutch infrastructure manager, states that open-category flights over the track are prohibited under national rules, with minimum distances of 25 m (drones under 4 kg) or 150 m (4–25 kg); specific-category flights over the track are allowed under conditions and must be reported to its rail control room.

SORA 2.5, STS-02 and PDRA-G03

A specific-category application rests on a SORA risk assessment; EASA brought in SORA 2.5 through ED Decision 2025/018/R, published on 29 September 2025. Two shortcuts reduce the work for linear assets:

• STS-02, a standard scenario you declare rather than apply for: BVLOS with a class C6 drone over a controlled ground area in a sparsely populated environment, up to 120 m, with flight visibility above 5 km, no further than 1 km from the remote pilot without airspace observers or 2 km with them.
• PDRA-G03, EASA's predefined risk assessment for "linear inspections, agricultural works": BVLOS over sparsely populated areas, close to obstacles, in controlled or uncontrolled airspace, with aircraft up to 3 m in size.

Both assume sparsely populated areas; corridors through towns and stations usually need a full SORA.

What the aviation approval does not cover

An operational authorisation lets you fly. It does not let you onto railway land, isolate an overhead line or occupy a possession — those come from the infrastructure manager, and the large ones run drone programmes with their own rules: Network Rail uses drones across 20,000 miles of track and 30,000 bridges, tunnels and viaducts, including the overhead wires.

Regulatory basis in the United States

Part 107 and BVLOS waivers

Under 14 CFR 107.31 the remote pilot must be able to see the aircraft throughout the flight, and § 107.205 lists that rule as waivable. Railroads have used waivers and exemptions for a decade: BNSF says it was selected in 2015 for the FAA's Pathfinder Program to test BVLOS flights, and by 2019 it was flying regular long-range BVLOS missions under FAA authority.

Part 108: proposed, not final

The FAA published its proposed Part 108 BVLOS rule on 7 August 2025 and reopened comments on right-of-way and electronic conspicuity in January 2026; as of late September 2026 no final rule had appeared in the Federal Register. One proposal matters directly to railways: § 108.205 would define shielded areas as airspace within 50 feet of railroad tracks, power lines, substations, bridges and pipelines, with the infrastructure owner's permission, and would give the drone right-of-way there. Plan today's programme on waivers, ready to move to Part 108 once it is final.

FRA track inspection rules

Drone imagery does not, on its own, satisfy the Track Safety Standards. 49 CFR 213.233 requires visual inspections made on foot or from a vehicle — weekly on Class 1–3 main track and sidings (twice weekly with passenger trains or over 10 million gross tons a year) and twice weekly on Class 4 and 5 track — and says other inspection devices "may be used to supplement visual inspection." Crews working on or near the track also fall under the railroad's roadway-worker-protection rules in 49 CFR Part 214, Subpart C. Build the business case around the mandated inspections, not on replacing them.

What to inspect, and with which sensor

The Association of American Railroads says freight railroads' drones carry high-resolution cameras, LiDAR and thermal sensors to find debris, vegetation growth, structural degradation, drainage problems, erosion and thermal anomalies.

LiDAR is doing more of the corridor work: Sweden's Trafikverket and NRC Group use drones to collect LiDAR data on the contact wire, ballast and vegetation without disturbing trains, and ProRail says LiDAR drones can take over mapping it used to do by helicopter.

Write the sensor specification per defect class, not per aircraft — the ground sampling distance to see a clip, the point density to model a contact wire, the thermal resolution to tell a warm clamp from a hot one — then check the aircraft delivers it at the height and speed your approval allows.

Operating models: crews, BVLOS corridors, docks

Docks are where Dronehub works. Our drone-in-a-box re-arms the aircraft with a two-minute robotic battery swap and is designed for 24/7 operation, with mission coverage of roughly 20 km per drone per flight, first-pass classification on onboard Nvidia compute, and reports reaching the operator within 15 minutes of landing through our in-house Sentinel AI; imagery stays on EU and US infrastructure. UAV Nomad, our mobile dock, swaps batteries on a vehicle moving at up to 30 km/h. Other dock makers differ — MicroAvia, for example, also swaps batteries and quotes one dock per 10 km of railway — so compare vendors on your own corridor. See our rail page and why operators move away from calendar inspection.

Operational safety near the line

• Magnetic and radio interference. ProRail warns that 1,500–25,000 V overhead lines can disturb drones' radio signals and electronics. The UK's Air Accidents Investigation Branch recorded a 2019 loss of control after take-off from a road bridge, where magnetic deviations of up to 140° were found above ducted high-voltage wires. Test compass behaviour at each launch site.
• Turbulence. ProRail notes that within 5 m of the track, turbulence can unbalance the drone and the pilot.
• Forced landings. Define who calls the signaller, who may go on the track and how the line is protected if the aircraft comes down foul of it.
• GNSS quality. Cuttings, tunnels and steel structures degrade positioning; locating findings to the sleeper may need RTK.

Data handling: privacy, sovereignty, the path to maintenance

Cameras pointed at a railway also see platforms, level crossings and gardens. EASA's guidance says a data protection impact assessment (GDPR Article 35) is required whenever processing is likely to result in a high risk to people's rights, should be done before the first flight, and should cover data minimisation. In practice: blur people and vehicles by default, keep raw footage only as long as maintenance needs it, and record who can see what.

Three further questions decide whether the programme is useful:

1. Where does the data live? Hosting jurisdiction, access control and an audit trail matter, especially for operators that count as critical infrastructure.
2. How do findings reach maintenance? Each finding needs a track position and an asset ID, and should land in the maintenance system as a work order, not a folder of images; see our note on edge and cloud inference.
3. How good is the model on your network? Ask any vendor for precision and recall on held-out data from your own track, human review of flagged frames, and a retraining plan.

Who offers railway drone inspection

Many large railways fly their own drones: Network Rail publishes its programme, PKP PLK reported that its own staff flew drones over more than 3,200 km of line in 2020–21 to supervise investment works, and BNSF has flown BVLOS under FAA authority. For operators that buy rather than build, the table lists companies that describe railway drone products or services on their own websites. It is not a ranking.

Where to start

Pick one segment with a known defect history, define the defect classes you care about, fly it long enough to compare drone findings with your inspection records, then choose between crews, corridor flights and docks. Approvals, the track-access agreement and the data path take longer than the flying — start them first. For the architecture behind an autonomous programme, read autonomous AI rail inspection; to scope a corridor with us, get in touch.