Comparison of O Class 122 'Bubble Car' models


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
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