« The Solvent » volunteer groups have also undertaken the restoration of two old tramways from the Verviers rail network, belonging to the Liège Transport Museum but threatened when the museum's storerooms were moved at the end of 2018. These two tramways date from 1929 and 1937 respectively and were both built in Hainaut (the first at the « Germain » workshops in Monceau-sur-Sambre, the second at « the Société métallurgique d'Enghien »). Both circulated on the Verviers rail network until its dismantling in 1969.
Finally, since 2021, « the Solvent » site has housed a collection of more than one hundred old printing machines from the 19th and 20th centuries, placed on deposit by the Walloon Heritage Agency. This is the old collection of machines gathered by one of the managers of the Casterman printing works in Tournai and entrusted to the Walloon Heritage Institute. Currently packed, this collection is still waiting for a project to be developed.