>>1348766In 1912 the two companies negotiated joining up the two lines by converting the line from Wohlen to Bremgarten to mixed gauge, and electrifying it. For this, a short stretch of track was built in Bremgarten between either terminus, including the bridge, the street running section, and another short section, pic related.
The mixed gauge was removed in 2015, after freight service to Bremgarten ended in 2009. Now the line is wholly metre gauge.