In 1957 there are signs of a recession in the freight market. Wagenborg puts a few more ships into service.
Late fifties, early sixties a number of Dutch coasters are sold abroad. Wagenborg responds well to the situation and starts to modernise the organisation and invests in the fleet. In 1959 the management orders six 500 tonners and a second large seagoing vessel, the "Bothniaborg".
Another important piece of history is written when the "Merweborg" is completed in 1959 by Apol in Appingedam. In 1951, a huge layer of rock salt is discovered close to Winschoten and the presence of this precious resource brings the Koninklijke Nederlandse (Royal Dutch) Soda-industrie to Delfzijl. Salt and soda production officially get underway and on 1 April 1959 the first cargo of salt is transported by the "Merweborg".