Compare OO Class 56
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| Manufacturer | Mainline | Hornby | Hornby | Cavalex Models | 
| Year model introduced | 1983 | 2007 | 2022 | 2023 | 
| DCC Capability | Motor fitted but no DCC socket. Ringfield motor | DCC Ready. 8-pin socket | DCC Ready. 21-pin socket | DCC Ready. 21-pin socket | 
| Bodyshell | ||||
| Bodyshells represented (of Prototypes) | ||||
| Class 56 - Doncaster & Crewe built | Yes | Yes | Yes | No | 
| Class 56 - Romanian-built | No | Yes | Yes | No | 
| Detailing | ||||
| Bodyshell - factory-fitted separate details | ||||
| Fan Grill (etched) | No | Yes | Yes | No | 
| Fan(s) | No | Yes | Yes | No | 
| Handrails | Yes | Yes | Yes | No | 
| Jumper cables | Yes | Yes | Yes | No | 
| Lamp irons | No | Yes | Yes | No | 
| Nameplates - etched - require fitting | No | Yes | No | No | 
| Nameplates - plastic - require fitting | Yes | No | No | No | 
| Radio antenna | No | Yes | Yes | No | 
| Representation of internal equipment (behind grilles) | No | Yes | Yes | No | 
| Side grilles (etched) | No | Yes | Yes | No | 
| Chassis/underframe detail | ||||
| Battery box | Yes | Yes | Yes | No | 
| Footsteps | Yes | No | No | No | 
| Fuel tank | Yes | Yes | Yes | No | 
| Pipework | No | Yes | Yes | No | 
| Sanding gear | No | Yes | Yes | No | 
| Cab, footplate & interior detail | ||||
| Crew figure(s) | Yes | No | No | No | 
| Detailed | Yes | No | No | No | 
| Detailed & painted | No | Yes | Yes | No | 
| Glazing | Yes | Yes | Yes | No | 
| Seating | Yes | Yes | Yes | No | 
| Window wipers | Yes | Yes | Yes | No | 
| Wheel "aesthetics" | ||||
| Chemically-blackened | Yes | Yes | Yes | No | 
| Bufferbeam detail (pre-fitted) | ||||
| Cosmetic coupling - hook only | Yes | No | No | No | 
| Lifeguard | No | Yes | Yes | No | 
| Sprung buffers | No | Yes | Yes | No | 
| Bufferbeam detail (in detailing pack) | ||||
| Cosmetic Screwlink couplings | No | Yes | Yes | No | 
| NEM Couplings | No | Yes | Yes | No | 
| Pipework (for front) | No | Yes | Yes | No | 
| Pipework (for rear) | No | Yes | Yes | No | 
| Mechanical | ||||
| Body Construction | Plastic with metal parts | Plastic with metal parts | Plastic with metal parts | No | 
| Working cosmetic features | ||||
| Opening cab doors | No | Yes | Yes | No | 
| Rotating fan(s) | No | Yes | Yes | No | 
| Chassis construction | Lightweight | Diecast | Diecast | No | 
| Loco-driven wheels (number of) | 6 wheels | 12 wheels | 12 wheels | No | 
| Minimum radius | Radius 2 | Radius 2 | Radius 2 | No | 
| Coupling socket/mounting | ||||
| NEM pockets | No | Yes | Yes | No | 
| Non-NEM socket | Yes | No | No | No | 
| Coupling type | Tension lock | Tension lock | Tension lock | No | 
| Weighting (to assist adhesion) | ||||
| Within chassis | Yes | Yes | Yes | No | 
| Separating the body from the chassis | Body clips off from chassis | Secured with one or more screws | Secured with one or more screws | No | 
| Electrical | ||||
| Motor type | 3-pole | 5-pole with two flywheels | 5-pole with two flywheels | No | 
| Motor location | 1 bogie mounted | Centre of chassis | Centre of chassis | No | 
| Power collection | 2 rail DC | 2 rail DC | 2 rail DC | No | 
| Working lights | ||||
| Directional headlights (no tail lights) | Yes | No | No | No | 
| Directional headlights & tail lights | No | Yes | Yes | No | 
| Pickups | Power bogie only | All wheels | All wheels | No | 
| DCC speaker | No provision for speaker | Provision for 20x40mm rectangular speaker | Provision for 20x40mm rectangular speaker | No | 
| Items in Stock | View | View | View | View |