In one of the model rail mag's a reader was 'complaining' he was unable to get a scale model fire engine for the steam loco era for his 'OO' loco's.
I had a quick look around the web and found nothing.
I know Triang did one for their Mimic Motorway in the early 60's, also a steam wagon, but these are now few & far between and the plastic tended to warp I understand.
Visited a county show on Saturday and they and a large marquee containing models of all types from boats, Lego (I never knew they produced a monorail train set !), Meccano and on one table a collection of fire engines, but non suitable for 'OO'.
My next port of call was the toy stands, one stall holder said he can not get hold of any but claims he could sell hundreds throughout the year.
One of the problems may be that up until 1941 there was no National Fire Service as local fires were dealt with by the local police. In fact a number of police offices had to be transferred into the new National Fire Service in the 40's as they were the only people with experience of the equipment.
My collection of 'Matchbox' vehicles included some old fire engines and a 'Green Goddess'.