Anlage 4101, Mast 93, Dead-end tower in Brühl, Germany.

Anlage 4101, Mast 93 is a 74.84-metre steel lattice dead-end tower north of the Bleibtreusee, built in 1975 by RWE for four 380 kV circuits. Two 380 kV circuits run from the Oberzier substation to the Sechtem substation on its traverses, and since 2002 the lowest traverse also carries the two circuits of the Cologne–Sindorf railway power line.

The mast was erected in 1975 by RWE and was notable at the time for including a public observation platform at 27 meters high. The platform was removed in 2010, but the tower continues to operate for power distribution.

The mast's name comes from its line, Anlage 4101, and its number in the sequence. Since 2002 its lowest crossarm has also carried the two traction-current circuits of the Cologne–Sindorf railway line, so the tower serves both the general grid and rail traffic. A concrete slab between the mast feet marks where the observation platform once stood.

The tower is visible from outside but sits in an industrial area with limited public access. It is best observed from a distance or from surrounding roads that cross the power line corridor.

The platform was reached by a staircase inside the mast, and it may have been the only observation deck ever installed on a high-voltage transmission tower anywhere in the world. After its 2010 removal, an inverted-V lattice structure remains in the mast body at the former platform height.