Comparison of OO Class 77 EM2 models
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| Manufacturer | Tri-ang | Heljan |
| Year model introduced | 1961 | 2013 |
| DCC Capability | DCC compatible but no socket. Complete rewire required - OO | DCC Ready. 21-pin socket |
| Detailing | ||
| Bodyshell - factory-fitted separate details | ||
| Handrails | No |
Yes |
| Horn(s) | No |
Yes |
| Lamp irons | No |
Yes |
| Pantograph - Cross-arm |
Yes |
Yes |
| Roof piping | No |
Yes |
| Roof-mounted electrical components | No |
Yes |
| Side grilles (etched) | No |
Yes |
| Chassis/underframe detail | ||
| Battery box |
Yes |
No |
| Cab, footplate & interior detail | ||
| Glazing |
Yes |
Yes |
| Window wipers | No |
Yes |
| Wheel "aesthetics" | ||
| Chemically-blackened |
Yes |
No |
| Bufferbeam detail (pre-fitted) | ||
| Cosmetic screw link coupling | No |
Yes |
| Bufferbeam detail (in detailing pack) | ||
| Pipework (for front) | No |
Yes |
| Pipework (for rear) | No |
Yes |
| Mechanical | ||
| Working cosmetic features | ||
| Pantograph (collects DC current from catenary) |
Yes |
No |
| Chassis construction |
Plastic & metal |
Plastic & metal |
| Loco-driven wheels (number of) |
4 wheels |
No |
| Minimum radius |
Radius 1 |
Radius 2 |
| Coupling socket/mounting | ||
| Fixed |
Yes |
No |
| NEM pockets | No |
Yes |
| Coupling type |
Tension lock |
Tension lock |
| Weighting (to assist adhesion) | ||
| Within chassis | No |
Yes |
| Separating the body from the chassis |
Secured with one or more screws |
Use plastic card (credit card format ideal) to slide between lower body and chassis, then undo lugs |
| Electrical | ||
| Motor type |
3-pole |
No |
| Motor location |
1 bogie mounted |
Centre of chassis |
| Power collection |
2 rail DC |
2 rail DC |
| Working lights | ||
| Directional headlights & tail lights | No |
Yes |
| Pickups |
Power bogie only |
No |
| DCC speaker |
No provision for speaker |
Pre-fitted |
| Items in Stock | View | View |
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