There is a jumper connection, so you could easily add your own switch or just use the jumper. G
Here is a picture comparison on a MTH Premier FF-2. PS-2 5V to PS-2 3V to PS-32.
The PS-2 5 and 3V had a variety of ways to be mounted. The PS-32 will have less, so some fits will be tougher as I mentioned in an earlier post.
More flexibility with sound files though and the latest flash code has the stm/diesel/electric/articulate and Quillable Whistle file. Trolley and electric pantographs will require a separate flash, as will a few other unique engines I believe.