Another absolutely superlative tour in the vicinity of Kaltern / Caldaro: Almost 80 km in length and requiring a high level of physical fitness, this route leads – after arriving via the bicycle path from Kaltern to Neumarkt / Egna – along the old railroad tracks to Kaltenbrunn / Fontanefredde and then on to Truden / Trodena. As you proceed along the course of the former Fleims / Fiemme Valley railroad line, you will climb approx. 800 meters of altitude differential with a grade of no more than 6%. This railroad line – stretching from Auer / Ora to Predazzo – was built during World War I by Russian prisoners of war to transport men and matériel from the Etsch / Adige Valley to the Fleims / Fiemme Valley and towards the front. After the conclusion of the war, this small railroad transported chiefly wood and passengers until it was finally shut down in the 1960s due to shrinking profitability. All that remained was the perfectly established route which, today, serves as a gravel road called the "former Fleims / Fiemme Valley railroad line" or "ex ferrovia". Because the locomotives back then were unable to manage a grade of more than five or six percent, this route is perfect for cyclists – you will be able to gently ascend the slope. The old railway tunnels – which seem like gloomy holes when you first approach them – shouldn't startle you: motion detectors will sense your approach and automatically switch on the lights. As you approach Kaltenbrunn / Fontanefredde, you'll turn off of the railway route and proceed a short distance uphill along the road to Truden. This gravel road is not overly steep and so is easily managed, and will take you up to the Ziss Saddle; this represents the transition to Altrei / Anterivo. Continuing to pedal uphill. Shortly before your reach the Horn Alm, you'll be treated to a fantastic long-distance view eastwards. Now you can enjoy the entire Fleims / Fiemme Valley and the majestic craggy towers of the Pale di San Martino looming behind the Rolle Pass. At an elevation of about 1,700 meters above sea-level, the Horn Alm is a very popular destination for cyclists coming from Bozen / Bolzano and its vicinity. From here, you'll take a short ramp uphill before you pass by Lake Schwarz and Lake Weiss on a gravel path downhill towards Gfrill / Cauria. This charming little hamlet is situated high above the Etsch / Adige Valley and affords a breathtaking view of the magnificent Dolomiti di Brenta. You will first proceed along the old and partially paved rural paths through alpine meadows and then downhill via Trail No. 7 – a forest trail requiring a high degree of technical skill and with almost 1,000 meters of altitude differential that will take you to Laag / Laghetti. The return trip to Kaltern in the afternoon is especially pleasurable when the weather is fine because that's when there's a strong southly wind (the so-called "Ora") blowing through the Etsch / Adige Valley that will act as a tailwind, giving you a little extra "push." It's thus no problem to achieve a speed of 40 km/h on average. All in all, the Trudner Horn is a superlative tour featuring great panoramas. However, it requires a medium-good level of technical skill and relatively good physical fitness.
Variants: In Truden / Trodena, you can decide whether you'd rather opt for the somewhat shorter and easier "Cisloner Alm" or "Kanzel" tours.
Mustn't be missed: The former Fleims / Fiemme Valley railroad line, Lake Weiss and Lake Schwarz, the villages of Truden / Trodena and Gfrill / Cauria.