05 001 and 05 002 were mainly used for test runs from 1935 to 1936.
On 30 May 1936 the 05 002 set an unbroken start stop speed record for steam locomotives: During the return run from a 190 km/h test Berlin-Hamburg it did the ~ from Wittenberge to a signal stop before Berlin-Spandau in 48 min 32 s, meaning average between start and stop.