- Mecanowelded frame with reaction blocks and retractable rail rollers
- Vertical ram with rail base clamp for straightening both welded and fishplated joints
- Double flow manual pump
- Maximum force: 400 or 1,000 kN
- Gauge-controlled stroke
- 2 models:
- JA40: for rails up to 46 kg/m
- JA100: for rails up to 60 kg/m
- Supplied with outrigger
- Weight:
- JA40: carried by 3 persons
- JA100: carried by 4 persons