If I remember correctly, the steam operates the whistles only. With the clock being of a normal electric type. Will have to see if I can locate the link for the info. as there are a number of them and the name of the company that makes them.
Basically you would need a number of solenoid valves for the whistle and chimes and some means of control to activate them and of course a boiler if using steam as a sound producer. Something along the line of a player steam calliope.