They have tunnel rescue trains on the high speed lines in Germany. The ones I have seen are "top and tailed" by diesel locos. Apart from these I don't know of any other similar trains around the World although I do remember seeing a picture of a Tunnel Fire-Fighting train for the Severn Tunnel many years ago in the days of steam. Maybe some of our overseas members can assist?
In Switzerland the Fire and Rescue trains are used as an extension of the local fire brigade and often attend fires at lineside properties that have little or nothing to do with the railway. The Swiss rail network lends itself to this sort of practice because it is very dense and most tracks are signalled for bi-directional running allowing these trains to get to the scene quickly. This certainly wouldn't work in the U.K.
John