My contribution to Tumm is the Selheika Quarry Railway.
It was opened in 1837 with a single 0-4-0 locomotive from England, 'Demesne'. It operated a twice-a-week train with horses taking lighter loads at the other times. The demand for stone came from the rebuilding of Selheika's harbour and breakwater. At its prime in 1848 the railway could afford a second locomotive, so the Danish 2-2-2WT 'Skjolla' was acquired. However in the 1870s the railway began to lose money rather rapidly due to the condition of its ageing locomotives and stock, and so was closed in 1878. From the 1880s to 1916, the line was unused. Rusting away, it was a (dangerous) playground for the local children. During WW1, sections of the track were destroyed by the WD in training exercises for soldiers attacking supply lines and railways. A short line along the old trackbed was built in 2'6" gauge to train the Engineers building trench railways on the Front. It was fully converted to narrow gauge (including overhead wire electrification of the port yard) post war. This line was then used by the NMR until the end of WW2 (the quarry was being used as a surveillance and espionage outpost/training area), when the quarry was reopened. In 1946 the new company, operating under the old Selheika Quarry Railway title, bought and regauged surplus engines from Scandinavia; a 2-8-0 and an 0-6-0T. An 0-4-0WT was bought at the same time but was found to be in poor condition when it arrived and so was stripped for parts to keep the others alive. These were used alongside the three electric locomotives previously owned by the NMR. Through the 1950s the company extended the line another 1/2 mile to reach new quarries, and a bronze age tomb was uncovered in 1952. The railway ran passenger trains up to the tomb on Saturday mornings from Selheika, with a return available in the late afternoon. The line was also used occasionally for military traffic from the NMR to Selheika.
Unfortunately the new quarries were short lived and the railway closed when the stone supply dried up in 1963. However a group of old workers and enthusiasts bought the line from the town to the tomb and a few assets (including the 0-6-0T and a battery locomotive) in 1969 after fundraising.
Thanks to PoT for including me in this great setting, and I'll make models of the early engines soon too!