Comparison of O Class 37 models

Heljan O Class 37 SkyTrex O Class 37 Heljan O Class 37 Heljan O Class 37 Heljan O Class 37
Manufacturer Heljan SkyTrex Heljan Heljan Heljan
Year model introduced 2008 2008 2017 2019 2024
DCC Capability DCC compatible but no socket DCC suitability unknown DCC Ready. Screw terminals for wired decoder DCC Ready. Screw terminals for wired decoder DCC Ready. ESU XL decoder socket
Bodyshell
Bodyshells represented (of Prototypes)
Class 37/0 as built - centre headcode No No Yes
No No
Class 37/0 as built - split headcode Yes
Yes
Yes
No No
Class 37/0 revised bodywork - centre headcode No No No No Yes
Class 37/0 revised bodywork - split headcode No No No No Yes
Class 37/4 No No No Yes
No
Class 37/5 - flat front No Yes
No No No
Detailing
Bodyshell - factory-fitted separate details
Door handles Yes
No Yes
Yes
Yes
Fan Grill (etched) Yes
No Yes
Yes
Yes
Fan(s) No No No No Yes
Handrails Yes
Yes
Yes
Yes
Yes
High intensity headlight No No No No Yes
Horn(s) No No Yes
Yes
Yes
Jumper cables Yes
No Yes
Yes
Yes
Lamp irons Yes
No Yes
Yes
Yes
Radio antenna No No No No Yes
Side grilles (etched) No No No No Yes
Vents No No No No Yes
Chassis/underframe detail
Battery box Yes
Yes
Yes
Yes
Yes
Boiler water tanks No No No No Yes
Footsteps Yes
Yes
Yes
Yes
Yes
Fuel tank Yes
Yes
Yes
Yes
Yes
Sanding gear Yes
No Yes
Yes
Yes
Speedometer cable Yes
No Yes
Yes
Yes
Cab, footplate & interior detail
Detailed No Yes
No No No
Detailed & painted Yes
No Yes
Yes
Yes
Glazing Yes
Yes
Yes
Yes
Yes
Seating Yes
No Yes
Yes
Yes
Window wipers Yes
Yes
Yes
Yes
Yes
Wheel "aesthetics"
Chemically-blackened Yes
No Yes
Yes
No
Painted No Yes
No Yes
Yes
Bufferbeam detail (pre-fitted)
Cosmetic coupling - hook only No Yes
No No No
Lifeguard No No No No Yes
Multiple working sockets/ pipes No No No No Yes
Pipework - pre-fitted to front Yes
Yes
Yes
Yes
Yes
Pipework - pre-fitted to rear Yes
Yes
Yes
Yes
Yes
Sprung buffers Yes
No Yes
Yes
Yes
Bufferbeam detail (in detailing pack)
Snow plough Yes
No Yes
Yes
Yes
Mechanical
Body Construction Plastic with metal parts
Plastic with metal parts
Plastic with metal parts
Plastic with metal parts
Plastic with metal parts
Working cosmetic features
Provision for smoke unit No No No No Yes
Rotating fan(s) Yes
No Yes
Yes
Yes
Chassis construction Diecast
Plastic & metal
Diecast
Diecast
Diecast
Loco-driven wheels (number of) 12 wheels
No 12 wheels
12 wheels
12 wheels
Minimum radius 6ft
6ft
6ft
6ft
3ft
Coupling socket/mounting
Screw Link Couplings Yes
No Yes
Yes
Yes
Coupling type 3-link coupling
No couplings
3-link coupling
3-link coupling
3-link coupling
Weighting (to assist adhesion)
Within chassis Yes
Yes
Yes
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
Secured with one or more screws
Secured with one or more screws
Electrical
Motor type 2 x 5-pole with flywheel
5-pole (standard)
2 x 5-pole with flywheel
2 x 5-pole with flywheel
2 x 5-pole with flywheel
Motor location Centre of chassis
Centre of chassis
Centre of chassis
Centre of chassis
1 mounted on each bogie
Power collection 2 rail DC
2 rail DC
2 rail DC
2 rail DC
2 rail DC
Working lights
Cab fault indicator lights No No No No Yes
Cab light No No No No Yes
Directional headlights & tail lights Yes
No Yes
Yes
Yes
Engine bay No No No No Yes
Headlights (independent) No No No No Yes
Illuminated headcodes No No No No Yes
Tail lights (independent) No No No No Yes
Pickups All wheels
No All wheels
All wheels
All wheels
DCC speaker Provision for a speaker (dimensions unknown)
No provision for speaker
Provision for a speaker (dimensions unknown)
Provision for a speaker (dimensions unknown)
Provision for a speaker (dimensions unknown)
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