Strasbourg – Basel route , where their performance immediately exceeded the requirements of the specification, then on the northern suburbs of Paris, whose lines had just been electrified. Their radius of action was rapidly expanding as the north-eastern network was electrified. In 1965, a quota was allotted to Dole, where they hauled international trains like the Orient-Express, sometimes double headed. At the end of 1964, the class was complete and the north-east network being fully electrified, the BB 16500s provided very varied services in an area ranging from Dunkirk to Paris and Vallorbe. However, the BB 25500 , dual-current heirs to the BB 16500, were introduced on the Jura lines and began to replace them in the spring of 1965, completely supplanting them by 1968. In the Paris region, the new BB 17000s, also derived from the BB 16500s, took over much of the northern suburban train operation from 1965. The BB 16500s then found new uses on the lines in the north-west of France, towards Le Havre, Deauville and Cherbourg. Decline The BB 16500s were little appreciated by drivers because of the discomfort linked to their overly flexible suspension and the short wheelbase of their bogies , hence their nickname "dancers". Nevertheless they operated a wide range of services during their careers: suburban, regional and international passenger trains, freight trains of all types, including trains over . The decline of the class began at the end of the 1990s, on the Transilien Paris-Est network, with the opening of line E of the RER. The trains that they hauled were partly replaced by the Z 22500 railcars, though they worked the Bondy – Aulnay shuttle until 2003, then disappeared from the Transilien Paris-Est network. Some of their services were taken over by BB 17000s . In the main regions where they are affected, orders for electric multiple units for the TER service and the massive order for new generation Alstom locomotives for freight confirmed their gradual decline despite good reliability, which remained remarkable in the early years of the 21st century, with only five incidents recorded per million kilometers traveled. Despite their slow decline, the BB 16500 saw a reprieve within the TER sectors in the 2000s . They were used in combination with regional reversible trains (RRR) and only these locomotives, along with the BB 17000s and BB 25500s can fulfill this requirement. Thus for the operation of the