Comparison of OO Class 81 models
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| Manufacturer | Trix | Hornby Dublo | Tri-ang |
| Year model introduced | 1962 | 1964 | 1966 |
| DCC Capability | DCC incompatible | DCC incompatible | DCC incompatible |
| Detailing | |||
| Bodyshell - factory-fitted separate details | |||
| Pantograph - Stone Faiveley AMBR |
Yes |
Yes |
Yes |
| Roof-mounted electrical components |
Yes |
No | No |
| Chassis/underframe detail | |||
| Battery box |
Yes |
No |
Yes |
| Cab, footplate & interior detail | |||
| Glazing |
Yes |
Yes |
Yes |
| Wheel "aesthetics" | |||
| Chemically-blackened | No | No |
Yes |
| Nickel-plated |
Yes |
Yes |
No |
| Traction tyres | No |
Yes |
No |
| Mechanical | |||
| Working cosmetic features | |||
| Pantograph (collects DC current from catenary) |
Yes |
Yes |
Yes |
| Chassis construction |
Diecast |
Diecast |
Diecast |
| Loco-driven wheels (number of) |
4 wheels |
4 wheels |
No |
| Minimum radius |
Radius 1 |
Radius 1 |
Radius 2 |
| Coupling socket/mounting | |||
| Fixed |
Yes |
Yes |
Yes |
| Coupling type |
Peco style |
Peco style |
Tension lock |
| Weighting (to assist adhesion) | |||
| Within chassis | No |
Yes |
Yes |
| Separating the body from the chassis |
Secured with one or more screws |
Secured with one or more screws |
Secured with one or more screws |
| Electrical | |||
| Motor type |
5-pole (standard) |
Ringfield |
3-pole |
| Motor location |
1 bogie mounted |
1 bogie mounted |
1 bogie mounted |
| Power collection |
2 or 3 rail DC |
2 rail DC |
2 rail DC |
| Working lights | |||
| Directional headlights & tail lights |
Yes |
No | No |
| Pickups | No |
Unpowered bogie only |
Power bogie only |
| DCC speaker |
No provision for speaker |
No provision for speaker |
No provision for speaker |
| Items in Stock | View | View | View |