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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands Diesel locomotive 10 was built for Rijkswaterstaat in Delfzijl by Diema in 1953. The locomotive is of type DS15. The locomotive came to SKL in 1978 and is now on display in the national narrow gauge museum. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands Diesel locomotives 14 and 15 of SKL were built for construction company Strijland in Uithoorn as numbers 10 and 11. They were built by Kromhout in Amsterdam in 1940 and are of type 2LS. The locomotives operated for Strijland until 1983, after which they were donated to SKL. They are now on display in the motor locomotive shed. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands Diesel locomotive 18 (Schokindustrie Zwijndrecht number 10) was built by Jung in 1957 and is of the very light type EL105. It came to SKL in 1985 and is currently stored in the museum depot. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands Diesel locomotive 23 is of type DS50 built in 1954 by Diema. Due to its high power and sturdy switch box, it is quite difficult to operate. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands Diesel locomotive 25 is one of the more modern locomotives, built in 1966 by O&K in Dortmund. Due to an accident the locomotive was soon stored. Its last restauration by SKL was completed in 2023. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands Diesel locomotive 31 was owned by Oving Spoor, a narrow gauge locomotive leasing company, between 1954 and 1988. It is of type ZL114 built by Jung. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands This Ruston diesel locomotive (SKL number 57) operated in Alphen a/d Rijn between 1951 and 1994. It is of type 20DL, of which 1198 were built. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands Diesel locomotive 9 is the oldest diesel locomotive owned by SKL. It was built in the 1920s by O&K in Nordhausen(D) for the Rotterdam water supply (Drinkwaterleiding) and operated as number 124 until 1977. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands Jung narrow gauge locomotive (factory number 4512) with a rather special outline. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands Diesel locomotive M 8 built for the Rotterdam Water Company in 1950. It is of type P4 built by Du Croo & Brauns. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands One of the motor locomotive sheds (with 6 roads). Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands View inside the museum depot, with locomotives waiting to be restored and many spare parts. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands View inside the museum depot, with locomotives waiting to be restored and many spare parts. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands The steam locomotive shed, next to the main "Valkenburg" station. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands Main station "Valkenburg ZH" where the steam trains depart. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands View from above of GTM steam locomotive 13 inside the narrow gauge museum. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands Steam locomotive 1 "Marijnke" is ready to return from the Museumdepot towards the Valkenburg main station. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands Steam locomotive 1 "Marijnke" runs around its train at the main Valkenburg station. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands Steam locomotive 1 "Marijnke" departs from the main Valkenburg station towards the museum depot. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands Steam locomotive 20 inside the national narrow gauge museum. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands Steam locomotive 4 "K.A. Neve" is seen stabled inside the steam locomotive shed. During my previous visit this locomotive operated the passenger trains. Katwijk, 25-10-2025 Photo by Marco van Uden

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Stoomtrein Katwijk Leiden/National Narrow Gauge Museum - The Netherlands Steam locomotive 5 "Sandra" is receiving maintenance in the steam locomotive shed. Katwijk, 25-10-2025 Photo by Marco van Uden

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Konstal 805Na No. 1724 and 1725 on route 8 at Sienkiewicza, Lodz, Poland, 06.05.2024. Photo by Michal Kozicki (michalmarekkozicki@gmail.com)