Registration Number : PVH 931
Chassis: Sunbeam S7A (3 axle)
Chassis No. TFD 74375
Motor : Metropolitan Vickers Type 210 CVI (150 hp)
Bodywork: East Lancs H40/32R
Length 30ft 0in, Width 7ft 6in.
Unladen Weight : 9tons 2cwts 0qtrs
Entered Service : 3 December 1959
Withdrawn : 11 July 1968
631 was the first of a batch of 10 Sunbeam S7A trolleybuses which entered service in Huddersfield in November/December 1959 to replace some of the ageing rebuilt Karrier E6 trolleybuses. These were Huddersfield’s last new trolleybuses and the last three-axle trolleybuses built for service in the United Kingdom. They followed the style of the previous Huddersfield trolleybuses (3-axle, double-deck, 7' 6" wide) to fit in with the rest of the fleet, despite the regulations having been relaxed a few years earlier which would have enabled these trolleybuses to have been built as two-axle. They were not particularly well-liked by the Huddersfield crews, who tried to have alternative vehicles allocated to them.
Life during 631s nine years in service was uneventful.However, when the trolleybus system in Huddersfield was abandoned in July 1968 the Huddersfield Trolleybus Preservation Society (HTPS) secured 631 for preservation. She was used for two successful enthusiast tours of other systems before she was 'retired' to museum work. On 27 October 1968 631 toured the Reading system with Belfast 168 and she ran another tour in Bournemouth on 24 November 1968.
631 was transferred to the site which became the Trolleybus Museum at Sandtoft in 1969. In 1974 the external paintwork was stripped and repainted.
The power supply at Sandtoft up until April 1992 had been supplied via a diesel generator. From 19 April 1992 the power supply for trolleybus operations was switched to the mains electricity supply and Huddersfield 631 was the first vehicle to operate using it.
In 2012 631 was decorated in true Huddersfield style to mark the Queens Diamond Jubilee.
On 10 January 2013 631 was towed to Swindon where she was externally repainted back into Huddersfield livery and a partial internal repaintwas carried out. The seating was re-upholstered too. On 3 May 2014 631 was returned to Sandtoft and recommissioned into service in July 2014.
Arguably 631 has been Sandtoft's most reliable service trolleybus over the years and is still in good condition.