KRAB U-LIGHT
Model: KRAB U-LIGHT Ultra-Light
Ultra-lightweight 22 kg track geometry trolley for maximum portability
The lightest full-featured KRAB at just 22 kg — one person can carry it off the track. Choose it when carrying weight is decisive; for everything else, and on jointed rails, the stiffer KRAB S-LIGHT is the usual choice.
Measurement Tasks
At a glance
KRAB U-LIGHT in Detail
Overview & Specifications
Why Choose KRAB U-LIGHT
- Portability is your top priority — 22 kg, one person can carry it off the track.
- You work in metros, tunnels, tight spaces or places with difficult access.
- Frequent relocation between measurement sites is required.
- You don't need heavy add-ons like LPS.
- Your track is continuously welded: on jointed rails the stiffer KRAB S-LIGHT gives steadier readings.
KRAB U-LIGHT is a railway track measurement trolley designed for accurate and efficient track geometry inspection. Its lightweight construction allows operation by a single user while maintaining reliable measurement performance. It is deployable on any gauge from 1000 to 1676 mm, on vignole and grooved rail profiles, and folds easily for transportation.
The trolley suits routine inspections, maintenance verification and infrastructure condition monitoring — with measurement at up to 8 km/h, adjustable gauge and up to 8 hours of battery life, it is a practical solution for maintenance teams and infrastructure managers.
Key Features
- Lightweight construction, approx. 22 kg
- Measurement speed up to approximately 8 km/h
- Adjustable nominal gauge from 1000 mm to 1676 mm
- Up to 8 hours of battery life
- On-board memory for at least 1000 km
- Suitable for track geometry inspection
- Easy handling by one operator
Options
- Non-contact technology option — 3D cameras available for rail profile scanning
- Rope & Bowden arresting mechanism — safe passage through frogs
- Optional switch measurement — auxiliary switch rollers for tongue width, guard rail groove, wing rail/frog groove, backgauge
Technical Specifications EN 13848-1 EN 13848-4
Weight
22 kg (basic), +1.5 kg (switch rollers)
Gauge Range
1000–1676 mm
Max Speed
~8 km/h
Battery Life
8 hours
Operating Temperature
−5 to +55°C
Scanning Interval
0.25 m (adjustable)
Sensor Resolution
0.1 mm
Memory Capacity
At least 1000 km of data
What It Measures
Base configuration without add-ons; LPS and rail profile cameras extend the list
| Parameter | Accuracy |
|---|---|
| Gauge | ±0.45 mm |
| Gauge Variation | ±0.5 mm/m |
| Vertical Alignment (Top) | ±0.7 mm (1–25 m) |
| Horizontal Alignment | ±1.0 mm (1–25 m) |
| Cant (absolute) | ±1.0 mm |
| Cant (relative, for twist) | ±0.7 mm |
| Twist | ±0.7/l mm |
| Speed | ±0.3 km/h |
| Track Distance | ±1.0 mm |
Compatible Add-ons
Track Cameras
KrabCamera or an IP camera photographs the track, rails, sleepers and surroundings at a set step (typically 1 to 10 m), each picture tied to the km position and viewed in KRAB 11 with the measured data. A 360° camera captures the full view around the trolley
IMU - Inertial Measuring Unit
Gyroscopes and accelerometers measure alignment, top and cant continuously and in real time; the data gives real geometry, chord geometry and the D1, D2 and D3 wavebands
Differential GNSS Receiver
A high-precision satellite receiver with RTK corrections (GPS, GLONASS, Galileo, BeiDou) over mobile broadband; the precise position is logged with the measurement
Compatible Software
Fully integrated with the KZV software ecosystem
Download Datasheet
Full technical specifications as a PDF:
Videos
ASI - Automatic Switch Inspection
ASI running an automated geometry and condition check on a switch. Automating the inspection catches faults early and keeps switch maintenance predictable.
Interested in KRAB U-LIGHT?
Contact us for detailed specifications, pricing, and delivery information