I went to teh museum with my 2 kids (14 & 12 years old). They loved teh hand-on experience and that tehy could hop a top a penny farthing, climb aboard an old tram, sit in teh driving seat of a steamroller.
Really is excellent fun. The staff also gave ,my kids quiz sheets to do as they went round - one to sport toy cars hidden inside or around real cars, the other to spot number plates throughout the museum - this challenge helped keep their interest going.
Nice shop and cafe facilities too.
Even better 2 under 16s are free with a paying adult - so I only had to pay £9.50 for the few hours of entertainment had.