Sorry, that is not an ice melter for the overhead wiring.
It is a Swiss narrow gauge yard switching engine #72.
An 0-3-0 diesiesel(I like steam or overhead electric:-))
I poked around and found out this was taken in a yard BEFORE the passenger terminal.
Was there at the passenger station in December 2009 and never knew about the yard-boo hoo:-(
Would have been easy to get to see the yard as we had time before the down train to Visp was scheduled.
Pic of the loco where you can see the 3 wheels.
https://www.flickr.com/photos/93471658@N08/33067807810/in/photostream/
Google earth view: https://www.google.com/maps/place/Zermatt+ZBAG-zsb/@46.0263519,7.7485807,17z/data=!4m12!1m6!3m5!1s0x478f3675f8223a67:0x54f01c8e682409e!2sThe+Matterhorn+Railway!8m2!3d46.0239862!4d7.7486031!3m4!1s0x0:0xb49f304d0311c195!8m2!3d46.0224292!4d7.7522627
The loco in question looks like it is in the Google earth pic next to the lettering for Spissstrasse.