Comparison of O Class 37 models
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| 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) |
| Items in Stock | View | View | View | View | View |