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Comparison of OO Class 77 EM2 models

Tri-ang OO Class 77 EM2 Heljan OO Class 77 EM2
Manufacturer Tri-ang Heljan
Year model introduced 1961 2013
DCC Capability DCC compatible but no socket. Complete rewire required - OO DCC Ready. 21-pin socket
Detailing
Bodyshell - factory-fitted separate details
Handrails No Yes
Horn(s) No Yes
Lamp irons No Yes
Pantograph - Cross-arm Yes
Yes
Roof piping No Yes
Roof-mounted electrical components No Yes
Side grilles (etched) No Yes
Chassis/underframe detail
Battery box Yes
No
Cab, footplate & interior detail
Glazing Yes
Yes
Window wipers No Yes
Wheel "aesthetics"
Chemically-blackened Yes
No
Bufferbeam detail (pre-fitted)
Cosmetic screw link coupling No Yes
Bufferbeam detail (in detailing pack)
Pipework (for front) No Yes
Pipework (for rear) No Yes
Mechanical
Working cosmetic features
Pantograph (collects DC current from catenary) Yes
No
Chassis construction Plastic & metal
Plastic & metal
Loco-driven wheels (number of) 4 wheels
No
Minimum radius Radius 1
Radius 2
Coupling socket/mounting
Fixed Yes
No
NEM pockets No Yes
Coupling type Tension lock
Tension lock
Weighting (to assist adhesion)
Within chassis No Yes
Separating the body from the chassis Secured with one or more screws
Use plastic card (credit card format ideal) to slide between lower body and chassis, then undo lugs
Electrical
Motor type 3-pole
No
Motor location 1 bogie mounted
Centre of chassis
Power collection 2 rail DC
2 rail DC
Working lights
Directional headlights & tail lights No Yes
Pickups Power bogie only
No
DCC speaker No provision for speaker
Pre-fitted
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