Comparison of O Class 121 'Bubble Car' models


Manufacturer	Dapol	Heljan
Year model introduced	2022	2024
DCC Capability	DCC Ready. 21-pin socket	DCC Ready. 21-pin socket
Detailing
Bodyshell - factory-fitted separate details
Door handles	Yes	No
Exhausts	Yes	No
Handrails	Yes	No
Lamp irons	Yes	No

Chassis/underframe detail
Battery box	Yes	No
Engine	Yes	No
Engine pipework	Yes	No
Footsteps	Yes	No
Fuel tank	Yes	No

Cab, footplate & interior detail
Detailed & painted	Yes	No
Glazing	Yes	No
Seating	Yes	No
Window wipers	Yes	No

Bufferbeam detail (pre-fitted)
Pipework - pre-fitted to front	Yes	No
Pipework - pre-fitted to rear	Yes	No
Sprung buffers	Yes	No

Mechanical
Body Construction	Plastic with metal parts	Plastic with metal parts
Chassis construction	Heavy diecast	Diecast
Loco-driven wheels (number of)	8 wheels	4 wheels
Minimum radius	6ft	6ft
Coupling socket/mounting
Screw Link Couplings	Yes	No

Coupling type	3-link coupling	3-link coupling
Weighting (to assist adhesion)
Within chassis	Yes	No

Separating the body from the chassis	Body clips off from chassis	Body clips off from chassis
Electrical
Motor type	2 x 5-pole with flywheel	5-pole with flywheel
Motor location	1 mounted on each bogie	Centre of chassis
Power collection	2 rail DC	2 rail DC
Working lights
Cab light	Yes	No
Directional headlights & tail lights	Yes	No
Headlights (independent)	Yes	No
Interior lighting	Yes	No
Tail lights (independent)	Yes	No

Pickups	All wheels	All wheels
DCC speaker	Provision for a speaker (dimensions unknown)	Provision for a speaker (dimensions unknown)
Items in Stock	View	View