The true start of diesel traction took place after the Second World War, with state support and after concentration of the rail network in a single concession, the Companhia dos Caminhos de Ferro Portugueses in 1947. It was during that year that the State introduced six shunting locomotives, which became known as "Drewrys", in reference to the English manufacturer, The Drewry Car Company.
They were acquired by the Companhia dos Caminhos De Ferro do Estado (C.F.E.) within the scope of the Portuguese Government's Refit Plan for modernising the railways. They entered service destined exclusively for shunting, in order to replace steam traction, whose operation was reduced by coal scarcity.
Initially allocated to the Lisbon area, they were assigned to Campolide Depot and performed services at Alcântara-Terra and Cais de Sodré station. In the 1950s, they moved to Barreiro station, whilst in the mid-1960s, the acquisition of new shunting locomotives led to the transfer of this series to Contumil depot, where they replaced steam locomotives. They finished their service in the north of the country at Porto-Campanhã and S. Bento, Régua and Contumil.
1996 marked the end of their careers and they were the first series of diesel shunting locomotives to be taken out of service.