The FP paybuses were a series of thirteen small 4 wheel railbuses built for the Department of Railways New South Wales between 1937 and 1970.

The rail buses were intended for use on branch lines whose low passenger numbers did not warrant the use of a larger railmotor.

FP1 was designed by the Road Motor Vehicles section of the Department of Railways & constructed by Waddingtons.

The rail bus was fitted with 34 in (864 mm) diameter wheels with a 13 ft 2 in (4.01 m) long wheelbase.

[1] Between August 2008 and July 2009, FP1 was fully restored at Eveleigh Railway Workshops by RailCorp apprentices.

[1] These three rail buses were fitted with 34 in (864 mm) diameter wheels with a 13 ft 2 in (4.01 m) long wheelbase.

FP5 was destroyed by an explosion in a payroll robbery attempt at Yanderra on the Main South line on 8 December 1941.

This attempted robbery killed all three rail employees that were aboard the pay bus at the time of the explosion.

Due to poor condition it was stored again on 20 October 1969, withdrawn on 3 November 1969 and scrapped on 5 December 1970.

These new pay buses had a longer and squarer body & were mounted on a 4 wheel chassis powered by an underfloor 6 cylinder Leyland model 0.400 horizontal diesel engine driving one axle via a Voith Diwabus model 501 fully automatic hydraulic/mechanical transmission & reversing gearbox.

In April 1970 FP7 was stripped internally and fitted with carpet on the walls and floor and movable chairs installed as well as being repainted externally.

It suffered a seized engine in February 1974 which coupled with a fuel strike saw the withdrawal of the rail bus service.