From "En Lignes" magazine of December 2017.
On 2 October 2017, the eight series 21 (2103, 2104, 2109, 2119, 2120, 2125, 2128 and 2129) locomotives sold to the Polish company Wagon-Rent Miros'aw Maszonski (see "En Lignes" 141, pages 14-15) were transferred from Ronet to Bydgoszcz (PL) by the HSL Polska's 653-07.
Here they are passing along the cliffs of Marche-les-Dames, between Namur and Liège. As the engines are not braked, they were interlocked between the tank cars of the train, these acting as a braking weight.
Collection Gwenaël Piêrart