Entrance fee: Free
Open house hours: Saturdays 9am to 12pm.
Where: Any fire station in Singapore (except Jurong Island Fire Station)
Tel: 1 800 280 0000 for general enquiries.
Call 6848 1519 to make a booking if visiting with a group size greater than 10.
Note: No prior booking required. But if you are visiting with a group comprising over 10 people, you are advised to make a prior booking, to avoid overcrowding at the fire station. They generally do not recommend groups larger than 50, due to space constraints at the stations.

Our take on this place:
Get to climb onto both the larger scale (as in above photo) and the Light Fire Attack Vehicle (LFAV, also nicknamed the Red Rhino).
A friend of ours happened to visit on a relatively quiet Saturday, so her son got a chance to sound the loud horn (read: ear drum bursting kind of loud) on the large fire engine; though that startled his sleeping baby brother.
Depending on the crowd size, if you are lucky, you may get to ride the Red Rhino around the fire station premises.