Weisshorn green
The Weisshorn uses as much as possible proven Roundhouse parts

The coal-fired Weisshorn

This model has the same clever boiler design as our other models. On top of that it includes an optional inertia unit with brake, working lights in a very small size without visible wiring, the possibility of a large whistle, a RC controlled steam blower, an improved damper system with small magnets and a hinged roof & backpanel. And it is a model of a still existing locomotive.

The Weisshorn

From 1890, the HG 2/3 type steam locomotives formed the basis of operations on the Visp-Zermatt railway. These were original wet steam tank locomotives with a combined drive for adhesion and gear operation with two coupled axles, a trailing axle and drive gears of the Abt system. The locomotives are intended for mixed operation with a maximum 12% gradient on the rack railway. The livery was original black. Of the eight units originally built by the Schweizerische Lokomotiv- und Maschinenfabrik Winterthur, two locomotives named Weisshorn and Breithorn have remained operational to this day at the Dampfbahn Furka-Bergstrecke in Switzerland. Watch this video.

The model in detail

Despite using reliable Roundhouse parts as much as possible, the model stays close to G scale 1 to 22.5.

Weisshorn side view green
Side view of a Weisshorn in a DFB green livery shows the length of the locomotive

Full remote controlled functions include regulator, reverser, whistle, damper, brake (optional) and blower. Receiver, rechargeables and all servos except for the regulator and blower servos are fully hidden away. All pictures on this page show the Weisshorn with full Remote Control.

Weisshorn open roof
Left: very uncluttered cab and hinged roof & backpanel. Right: enlarged side view of the improved damper system with two very small magnets 1*0.5mm just visible between door handle and brass damper arm.

The cab lay-out is very neat and leaves ample room. Water gauge and regulator & blower hand wheel are close to scale.
The water level of the boiler is easy to read because of the long reading glass of the water gauge. Just like in a real loco, the black-white background improves readability of the reading glass even further.

The improved damper system with small magnets prevents the damper falling open unexpectedly.

Lights Weisshorn
Working head, back and cabin lights

The optional inertia unit with brake allows for smooth and slow running (Hitec Hs40 servo not included). Watch this video running slow.
The additional inertia is so high that acceleration and deceleration becomes as slow as in a real HG 2/3. Friction and noise are low thanks to a 2-stage ball-bearing high-ratio gear train and 2 large diameter, high mass flywheels.
The inertia unit is fitted with a cogwheel that fits a LGB rack rail. Important, read this FAQ, how to run on rack track.

Weisshorn underside
To the left: the ash pan with grid of the coal-fired boiler, the springloaded pony truck and the whistle. Mid: the inertia unit with cogwheel and brake (prototype version). Fully right: the wiring of the front lights.

Weisshorn underside with pony upward
To remove the ash pan with grid, the pony truck can turn fully away

The Weisshorn is easy to drive: you can run without attending coal or water for up to 17-21 minutes (a gas-fired locomotive runs under similar conditions 20-25 minutes). The boiler contains all water for a full run. After a run coal and water is topped up under steam. The advantages of this coal-firing system are explained in the special design features page.
The valve for topping up the water is hidden under the sand dome. The stainless drop down fire door has a built-in damper function to control the heat of the coal fire and hence of the steam pressure. For manual locos see details here.

Weisshorn backside blue
Back view of a Weisshorn in a DFB blue livery

Keeping the fire going is easy due to a very wide and deep fire-box. The stainless steel ash pan with grate hinges on two pins and can be easily removed. The door of the smoke box can be opened and is fitted with a heat shield on the inside.

Weisshorn blue
Side view of a Weisshorn in a DFB blue livery

Building the Weisshorn

This is not a "build it in one evening" project. However any average modeler with care and patience can build a coal-fired locomotive to be proud of. All painting is left to the builder, minimal drilling and cutting is necessary. Only simple tools are needed. Read the related FAQs.
The body is riveted together with real rivets. The pictured prototype is fitted with Swiss style lamps as delivered with the kit. The lamps can also be equipped with LEDs. See these instructions.


The Weisshorn comes as a Weisshorn coal-fired boiler kit, a Weisshorn chassis & body kit (includes 6 Swiss styled lamps) and needs additional Roundhouse parts. For this model no frame and body parts of Roundhouse are used, so you need less RH parts (compared to an Amy in value about €460 less).
You can opt for an inertia unit. This unit and the chassis & body kit are available only in combination with a Weisshorn boiler kit.
The kit comes complete with boiler certificate and step by step instructions and contain the following parts. Check out the price list and terms & conditions of sale.

You can contact us by e-mail :  mail@riverdale-loco.com  or by telephone: +31 499 476808

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