Compare O Class 25
|   |   |   | |
| Manufacturer | Bachmann Brassworks | Heljan | Heljan | 
| Year model introduced | 1999 | 2016 | 2019 | 
| DCC Capability | DCC incompatible | DCC compatible but no socket | DCC Ready. Screw terminals for wired decoder | 
| Bodyshell | |||
| Bodyshells represented (of Prototypes) | |||
| Class 25/0 - original/old style - vents on sides | No | Yes | No | 
| Class 25/3 - vents on roof "New style" | No | No | Yes | 
| Detailing | |||
| Bodyshell - factory-fitted separate details | |||
| Door handles | No | Yes | Yes | 
| Fan Grill (etched) | No | No | Yes | 
| Handrails | No | Yes | Yes | 
| Lamp irons | No | Yes | Yes | 
| Side grilles (etched) | No | Yes | Yes | 
| Chassis/underframe detail | |||
| Battery box | No | Yes | Yes | 
| Footsteps | No | Yes | Yes | 
| Fuel tank | No | Yes | Yes | 
| Sanding gear | No | Yes | Yes | 
| Cab, footplate & interior detail | |||
| Detailed & painted | No | Yes | Yes | 
| Glazing | No | Yes | Yes | 
| Seating | No | Yes | Yes | 
| Window wipers | No | Yes | Yes | 
| Wheel "aesthetics" | |||
| Chemically-blackened | No | Yes | Yes | 
| Bufferbeam detail (pre-fitted) | |||
| Cosmetic screw link coupling | No | Yes | Yes | 
| Lifeguard | No | Yes | No | 
| Pipework - pre-fitted to front | No | Yes | Yes | 
| Pipework - pre-fitted to rear | No | Yes | Yes | 
| Sprung buffers | No | Yes | Yes | 
| Mechanical | |||
| Working cosmetic features | |||
| Rotating fan(s) | No | Yes | Yes | 
| Chassis construction | No | Diecast | Diecast | 
| Loco-driven wheels (number of) | No | No | 8 wheels | 
| Minimum radius | No | 3ft | 3ft | 
| Coupling socket/mounting | |||
| Screw Link Couplings | No | Yes | Yes | 
| Coupling type | No | 3-link coupling | 3-link coupling | 
| Weighting (to assist adhesion) | |||
| Within chassis | No | Yes | Yes | 
| Separating the body from the chassis | No | Body clips off from chassis | Body clips off from chassis | 
| Electrical | |||
| Motor type | No | 2 x 5-pole with flywheel | 2 x 5-pole with flywheel | 
| Motor location | No | Centre of chassis | Centre of chassis | 
| Power collection | No | 2 rail DC | 2 rail DC | 
| Working lights | |||
| Cab light | No | Yes | Yes | 
| Directional headlights & tail lights | No | Yes | Yes | 
| Pickups | No | All wheels | All wheels | 
| DCC speaker | No | Provision for a speaker (dimensions unknown) | Provision for a speaker (dimensions unknown) | 
| Items in Stock | View | View | View |