A closed bag
shouldn't be a
blind spot.
Critical Catalysts is engineering a handheld screening device that gives railway security personnel a first, real-time look inside a suspicious bag — without opening it, and without waiting on a fixed scanner.
Coverage stops where the scanner does.
Indian Railways moves an extraordinary volume of people and baggage every day, across stations, platforms and parcel offices — most of which sit outside the reach of any fixed screening infrastructure.
Scale outpaces fixed points
Large X-ray scanners and baggage tunnels are necessarily installed at a handful of checkpoints — not on every platform, parcel counter, or patrol route.
Static infrastructure
Fixed systems screen what passes through them. An unattended bag left on a platform, or a parcel in transit, may never reach one.
Canine units are finite
Detection dogs remain highly capable, but their numbers, training cycles, and working hours limit how many locations they can cover at once.
Gaps in between
Between chokepoints, security personnel today have no quick, on-the-spot way to screen a suspicious closed bag before deciding whether to escalate.
Screening that travels with the officer.
Instead of asking bags to find a scanner, our concept brings preliminary screening capability directly to the platform, the parcel office, or the patrol route — as a lightweight complement to fixed systems and canine units, not a replacement for them.
Held like an instrument and operated with a single scan trigger, the device is intended to give a security officer a preliminary read — normal, suspicious, or inconclusive — in seconds, so a decision to escalate can be made on the spot rather than after the fact.
One bag, six stages, one recommendation.
Scroll through the pipeline the device runs on every scan — from placing the bag in front of the scan window, to a result the officer can act on.
Nine systems, one shell.
A single ruggedised housing integrates imaging, sensing, compute, and power — engineered to be carried and operated one-handed in the field.
Non-invasive imaging module
- Compact, shielded imaging source
- Collimator + high-sensitivity detector array
- Reads internal structure without opening the bag
Trace / vapour sensing module
- Multi-sensor array (IMS / PID / MOS-class)
- Air intake with micro-pump
- Replaceable filter element
Edge AI processing unit
- On-device SoC / NPU
- Real-time inference, no network dependency
- Secure local storage
Display & UI module
- Sunlight-readable touch display
- Result, confidence, and system status
- Guided alerts for the operator
Power management system
- Regulated power delivery
- Over-current / over-voltage protection
- Continuous power monitoring
Battery pack
- High-capacity cells with smart BMS
- Hot-swap capable for continuous duty
- Full-shift target runtime
Operation controls
- Power & scan trigger
- Function keys, status indicators
- Single-hand operable layout
Interface & connectivity
- USB-C for data and charging
- Wi-Fi / Bluetooth for sync
- Encrypted data transfer
Structural body
- Rugged, shock-absorbing housing
- EMI shielding
- Sealed against dust & field conditions
Two signals, one decision.
Neither imaging nor trace sensing alone tells the full story. The device is designed to fuse both on-device, in real time, to produce a single preliminary risk read.
The imaging module contributes structural cues from inside the bag; the trace module contributes chemical signatures detected at the surface. Edge AI weighs both together, entirely on-device, to compute a preliminary risk assessment — without sending data off the unit or waiting on a network connection.
- 01On-device inference. No cloud round-trip needed to produce a result.
- 02Weighted fusion. Each signal is scored, then combined — not treated in isolation.
- 03Confidence, not certainty. Every result ships with a confidence level, never a flat pass/fail.
Screening shouldn't wait at the gate.
The handheld form factor is designed to sit alongside existing methods — extending where preliminary screening can happen, rather than competing with what already works.
| Capability | Fixed X-ray systems | Canine units | Handheld device (concept) |
|---|---|---|---|
| Where it works | Fixed checkpoints only | Wherever deployed | Any platform, counter, or route |
| Setup / mobility | Permanent installation | Requires handler & training cycle | Single officer, single hand |
| Result | Detailed image, needs interpretation | Alert / no alert | Normal / suspicious / inconclusive + confidence |
| Best used for | High-throughput chokepoints | Targeted sweeps | Fast, on-the-spot preliminary checks |
One device, five use cases.
Designed for Indian railway conditions — rugged, low-power, and simple enough to operate during a routine patrol.
Railway stations
Screening bags and luggage at entry points and concourses.
Platforms & trains
On-spot checks of unattended bags and suspicious items.
Parcel & cargo areas
Screening parcels and cargo before onward transit.
Security checkpoints
Adding a mobile layer to existing checkpoint security.
On-board patrolling
Handheld mobility enables random checks during journeys.
The device flags.
An officer decides.
Every scan produces one of three preliminary reads. Nothing about a suspicious or inconclusive result is final — it is a prompt for a trained officer to carry out secondary inspection under existing railway security protocol.
Smarter detection.
Safer railways.
Critical Catalysts — building a portable first line of screening for Indian Railways security.
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