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HO Scale Model Tram Overhead Masts

Model Tramway Overhead Masts

BEC-KITS supply HO-scale metal overhead masts and wire for 1:87 scale continental tramway layouts. The masts are too short for 1:76 scale British tramways with double deck trams. At present, the following are available:

• Sommerfeldt Oberleitungen/Stromabnehmer (overhead wiring and power collectors), Hattenhofen, Germany.
• Alan Kirkman Overhead Wire

Sommerfeldt Overhead Masts

Picture	Part Number	Description	Availability = Yes = Out of stock = Built to order	Price
	SOM107	HO Pole side modern bracket arm, single track		£3.40
	SOM108	HO Pole centre modern bracket arm, double track		£4.50
	SOM109	HO Pole side modern bracket arm, double track		£4.30
	SOM110	HO Pole		£1.45
	SOM111	HO Pole side arched bracket arm, single track		£2.60
	SOM112	HO Pole centre arched bracket arm, double track		£3.60

Alan Kirkman Overhead Wire

Picture	Part Number	Description	Availability = Yes = Out of stock = Built to order	Price
	PTOH01	Nickel silver wire, 0.3mm diameter, 10m long reel		£2.50

Fitting overhead wiring

The overhead masts have a 20mm long threaded base. They are bolted into 3.0mm diameter holes drilled in the layout baseboard. On curves, one bracket mast is required for every 30 degrees of curve as a minimum. At points, an overhead support should be mounted about two-thirds of the distance from the start of the blade of the point towards the frog of the point.

The wire height should be about a scale 6.35m (about 20 to 21 feet) above the track for continental tramways. In HO scale 1:87 (3.5mm:1 foot), this scales to 73mm between the wire and rail head.

Overhead wiring for use with pantographs and bow-collectors is fitted as stiff individual pieces of wire between adjacent masts. For HO gauge, Sommerfeldt supply 0.7mm diameter in 50cm lengths. BEC-KITS supply the Alan Kirkman 0.3mm diameter nickel silver wire in 10m long reels, which can be used for both pantographs and trolley poles.

For pantographs and bow collectors, the wire should be mounted to lie vertically above the track centre. It must lie inside the rails on curves to keep contact with the pantograph pan. For trolley poles with fixed heads, the best position for the wire on curves is above the inside rail.

The following wiring method is unsuitable for trolley poles.

To fit the wire, the 2 - 3mm end of the wire should be bent through 180 degrees using small pliers and fitted to the first mast. Hold the wire in position under the next mast. Using small sharp wire cutters, cut the wire 3mm beyond the mast. Remove the wire and use the small pliers to bend the other end of the wire. Note that the two bends on each piece of wire do not lie in the same plane but are twisted by about 90 degrees. Use the same clockwise direction for each piece of wire. The diagrams show how the two wires interlock after fitting at a mast. For more stability, they may be soldered to the mast and excess solder removed from underneath by filing.

For trolley pole wiring:

To use the overhead parts with trolley poles, working trolley pole kits, ears and frogs are available from Alan Kirkman and East Lancs Model Tramway Supplies .

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