I was searching for sources of Bailey components today and found this info:
NZ Transport Agency: Bailey Emergency Bridging
A standard bridge (30m long, single span) could be erected and in use within a week. 
NZ Army: Medium Girder Bridge
Double storey 30 m span, class 60, Erection in 45 min 
so the old skills are still practiced, but there is less urgency when the bullets aren't flying.
My employer has had a Bailey in use for 15 years now. A replacement is planned, but with rising river bed levels they don't want it buried like its predecessor. The Bailey carries loaded logging trucks daily.
Its always a pleasure to see a Bailey, almost as good as seeing a CMP!
Rob