Comparison of O Class 122 'Bubble Car' models
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| Manufacturer | Bachmann Brassworks | Dapol | Heljan |
| Year model introduced | 2003 | 2021 | 2024 |
| DCC Capability | DCC compatible but no socket | DCC Ready. 21-pin socket | DCC Ready. 21-pin socket |
| Detailing | |||
| Bodyshell - factory-fitted separate details | |||
| Destination blinds/ box | No |
Yes |
No |
| Door handles | No |
Yes |
No |
| Door steps | No |
Yes |
No |
| Exhausts | No |
Yes |
No |
| Handrails | No |
Yes |
No |
| Horn(s) | No |
Yes |
No |
| Lamp irons | No |
Yes |
No |
| Vents | No |
Yes |
No |
| Chassis/underframe detail | |||
| Air tank | No |
Yes |
No |
| Battery box | No |
Yes |
No |
| Brake rigging chassis | No |
Yes |
No |
| Engine | No |
Yes |
No |
| Engine pipework | No |
Yes |
No |
| Exhaust silencer | No |
Yes |
No |
| Footsteps | No |
Yes |
No |
| Fuel tank | No |
Yes |
No |
| Gearbox | No |
Yes |
No |
| Sanding gear | No |
Yes |
No |
| Speedometer cable | No |
Yes |
No |
| Cab, footplate & interior detail | |||
| Detailed & painted | No |
Yes |
No |
| Detailed guards compartment | No |
Yes |
No |
| Glazing | No |
Yes |
No |
| Luggage Racks | No |
Yes |
No |
| Seating | No |
Yes |
No |
| Window bars | No |
Yes |
No |
| Window wipers | No |
Yes |
No |
| Wheel "aesthetics" | |||
| Chemically-blackened | No |
Yes |
No |
| Bufferbeam detail (pre-fitted) | |||
| Pipework - pre-fitted to front | No |
Yes |
No |
| Pipework - pre-fitted to rear | No |
Yes |
No |
| Sprung buffers | No |
Yes |
No |
| Mechanical | |||
| Body Construction | No |
Plastic with metal parts |
No |
| Chassis construction | No |
Heavy diecast |
No |
| Loco-driven wheels (number of) | No |
8 wheels |
No |
| Minimum radius | No |
3ft |
No |
| Coupling socket/mounting | |||
| Screw Link Couplings | No |
Yes |
No |
| Coupling type | No |
3-link coupling |
No |
| Weighting (to assist adhesion) | |||
| Within chassis | No |
Yes |
No |
| Separating the body from the chassis | No |
Secured with one or more screws |
No |
| Electrical | |||
| Motor type | No |
2 x 5-pole with flywheel |
No |
| Motor location | No |
1 mounted on each bogie |
No |
| Power collection | No |
2 rail DC |
No |
| Working lights | |||
| Cab light | No |
Yes |
No |
| Directional headlights & tail lights | No |
Yes |
No |
| Headlights (independent) | No |
Yes |
No |
| Interior lighting | No |
Yes |
No |
| Tail lights (independent) | No |
Yes |
No |
| Pickups | No |
All wheels |
No |
| DCC speaker | No |
Provision for a speaker (dimensions unknown) |
No |
| Items in Stock | View | View | View |
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