The Re 450 is a push-pull electric locomotive of Swiss Federal Railways (SBB CFF FFS), which combined with passenger coaches is only used for commuter rail services of Zurich S-Bahn in the metropolitan area of Zurich.

At peak-hour times, trainsets may be coupled together to form a train consisting of three locomotives and nine passenger vehicles.

In 2008, two Re 450 trainsets, with locomotives Re 450 067 and Re 450 070, were sold to Sihltal Zürich Uetliberg Bahn (SZU), where they are now designated as Re 456 551-1 and Re 456 552-9, respectively.

[4] All Re 450-hauled trainsets received a mid-life refurbishment at the SBB CFF FFS workshops in Yverdon-les-Bains between 2011 and 2018 (now named DPZplus).

The livery was changed: the formerly yellow doors are now painted red on the coaches and dark blue on the locomotives, and the front now shows the SBB logo instead of only the vehicle number.