In September 2013 Axpo Trading moved its headquarters from Laufenburg to Dietikon.
Continuing from the BD line the first stage would lead from Dietikon to Spreitenbach and Killwangen.
Upon the merging of the canton of Baden into Aargau in 1803, the district gained the municipalities of Würenlingen, Bellikon, Künten, Remetschwil, Stetten, Mellingen, Wohlenschwil and Mägenwil (from neighbouring districts of the canton of Baden) but had to give up Hüttikon, Oetwil an der Limmat, Dietikon and Schlieren to the Canton of Zurich.