British Rail Class 399

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Supertram Citylink
British Rail Class 399
Supertram 399202 Donetsk.jpg
Supertram 202 on test at Donetsk Way, April 2017
In service17 September 2017
ManufacturerVossloh España
Built atValencia, Spain
Family nameCitylink
Entered service2017–
Number built7 units
Fleet numbers399201–399207 (TOPS)
201–207 (Supertram)
Capacity88 (seated)
150 (standing)
Operator(s)Sheffield Supertram
Depot(s)Nunnery depot
Line(s) servedSupertram network
Dearne Valley Line
Train length37.2 m (122 ft 58 in) (3 sections)
Car length(?)
Width2.65 m (8 ft 8 38 in)
Height3.6 m (11 ft 9 34 in)
4 per end section
Articulated sections3
Maximum speed100 km/h (62 mph)
WeightApprox 66 t (65 long tons; 73 short tons)
Traction motors6 x 145 kW VEM
Acceleration1.15 ms−2
Deceleration1.2 ms−2
Electric system(s)25 kV 50 Hz AC OHLE
Current collection methodPantograph (AC/DC)
Safety system(s)GSM-R
Track gauge1,435 mm (4 ft 8 12 in) standard gauge
Data Sheet

The Class 399 Citylink[1] is a type of rail vehicle built by Vossloh for operation by Sheffield Supertram. While it is a low floor tram, it is also capable of being used upon the National Rail network as well; the Class 399 is the first tram-train to see operational use in the United Kingdom.

During 2013, an order was placed with Vossloh for the construction of a batch of nine tram-trains for Supertram. It will be operated as a pioneering tram-train hybrid vehicle as part of an initial pilot of the operation of such vehicles.[2] The launch of live services using the Class 399 was repeatedly delayed, reportedly due to planning and development-related difficulty experienced by Network Rail, who were responsible for the installation of additional track and other infrastructure-related changes to accommodate the tram-trains upon the heavy rail network, as well as a necessary full track replacement programme performed by Supertram.

During January 2016, the first tram-train commenced live testing on the Supertram network. On 14 September 2017, the first Class 399 officially entered passenger service, but the type was initially restricted to only some sections of Supertram's network as further work was still required on other parts, including Network Rail lines. Full service was launched on 25 October 2018.[3] The results of the trials may become a decisive factor on the adoption of tram-train technology at various other sites across the country.



During 2008, the Department for Transport (DfT) announced plans to operate a trial tram-train service using the Penistone Line in South Yorkshire. As initially envisioned, the trial was to function as two-year pilot programme, as the service would be the first use of combined tram-train operations anywhere in the UK.[4] The scheme was jointly delivered by the DfT, Sheffield Supertram, Stagecoach, Network Rail, Northern Rail and the South Yorkshire Passenger Transport Executive (SYPTE). The adoption of tram-trains would allow Supertram services to travel on the national rail network, which had the advantages of opening up new routes, integrating multiple transit networks together, and potential for further expansion.[4]

In addition to the local impact of the scheme, it has been anticipated that the trial could be invaluable to transport operators through the United Kingdom. Careful scrutiny is to be applied to the service's reliability and popularity; in the long run, the detirmined level of success could be a decisive factor on the further implementation of tram-train technology across the country.[4] According to Rob Carroll, major projects manager at Supertram, the tram-train project team has been approached by multiple organisations, highlighting the interest expressed by representatives of the Manchester Metrolink, transport managers studying options for a rail link to Glasgow Airport, and personnel from South Wales. The prospect of being able to readily combine heavy and light rail networks together is considered to be an attractive prospect in some cities.[4][5][6]

Planning and selection[edit]

The originally-intended route for the tram-train trials was an unelectrified line and as such, this would have required the procurement of a number of specially-built vehicles due to the necessitity for them to be diesel powered, as there were no plans to include electrification as part of the trial.[7] Originally, the trial was intended to start operating for two years from 2010, but, during 2009, the proposal was revised as the original plan had not included any on-street running. The revised proposal envisaged the use of the Supertram network, using a new link constructed to connect it to the Dearne Valley Line to Rotherham, that would then allow trams to operate on both heavy rail and light rail lines. As part of the project, the line would be electrified, allowing more cost-effective electric vehicles to be procured.[8] During May 2012, approval for the tram-train trial was issued by the DfT, along with a commitment of £58 million towards the construction of a 400 meter chord to serve as the link between the Network Rail and Supertram networks, as well as the electrification of 8 miles of the route to Rotherham and the purchase of seven new tram-train vehicles.[2]

During 2013, it was announced that Spanish rail manufacturer Vossloh España had been selected to construct the new tram-trains for Supertram; at the time of the selection, the first units were scheduled to be delivered in September 2015.[9] Under Supertram's numbering system, the seven units were numbered as 201-207; however, because part of their operation is on the National Rail network, they are required to be registered under the Total Operations Processing System used for main line rail vehicles, which led them to be allocated under TOPS as Class 399. In November 2015, the first Class 399 unit finally left the factory at Valencia, Spain, and was due for delivery to Sheffield by the beginning of December.[10] The last of the seven Class 399 vehicle was delivered overnight on 20 November 2016.

Delays and issues[edit]

The tram-train service has been delayed many times due to different factors. While the first deliveries of the tram-trains themselves were due to happen in September 2015,[9] this deadline was subsequently put back to December 2015.[11] During late 2015, it was announced that the tram-train project had been delayed by one year. A Network Rail spokesman stated at the time that the project would be delayed until 2017 and attributed this to the organisation having to wait for the needed permission of the transport secretary to carry out the construction of new track at Tinsley.[12]

During May 2016, the project was effectively delayed once again when it was announced that a 2017 start date would "not be possible".[13] Speaking at the time, Network Rail referred to the complexity present in elements of the design and planning of the envisioned tram-train operations, and that a thorough review of the programme was in the process of being conducted by the organisation and SYPTE.[13] Amongst the various changes required in advance of the new unit's operational use, the entirety of the Supertram network had to be re-profiled.[4] During November 2016, while in the midst of a review of the associated programme of works, it was announced that full tram-train services would commence in summer 2018, having encountered factors which had necessitated yet another delay.[14]

During December 2017, a highly-critical parliamentary report on the developing tram-train programme was released.[15] According to the report, costs had risen to £75.1 million, around five times of the original £15 million budget originally allocated for the programme. It also found there to have been a "high level of risk and uncertainty" and ""unacceptable cost increases and delays", while the DfT were criticised for failing to question if the project still offered value for money or fulfilled its goals.[15]


The Class 399 is a dedicated tram-train unit. The primary purpose of the type is to operate the tram-train service between Sheffield and Rotherham; as such, it is designed to run on both the National Rail and Supertram networks.[4] Each vehicle is composed of three articulated sections, which are fitted with a total of three motorised bogies and one unpowered trailer bogie, complete with a pneumatic suspension system. They are bi-directional units, which eliminates any need for turnaround facilities to be installed; rear-view camera displays are also present in the driver’s cab for improved visibility and situational awareness.[4]

To suit the two different networks, the Class 399 are dual voltage vehicles, capable of operating on both the 750 V OHLE of Supertram's network, and the 25 kV OHLE that is the standard on the National Rail network. Although the route to Rotherham will be electrified to the 750 V standard used on the rest of the Supertram network, the installation of dual voltage capability is to allow the vehicles to be "future-proofed" for use as and when the Midland Main Line north of Sheffield is electrified.[16][4] The process for switching between the two different power supplies is automated by an integrated Automatic Power Control (APC) system. This system is triggered by a series of magnets which have been embedded at key locations on the ground outside of the track, while the two power supplies are intentionally separated a neutral section of track.[4] In practice, the vehicle travels over the first magnet to trigger the circuit breakers to open, after which it coasts through the short neutral section before the new voltage is detected and the circuit breakers are closed again. While the APC provides an automated process for this, there is a manual override allowing the driver to close the circuit breaker if circumstance ever requires this to be done.[4]

The Supertram lines and the National Rail network also use vastly different signalling systems.[4] When travelling on the Supertram network, signals are primarily provided to the driver visually; the tram-trains also make use of the same vehicle identification system (VIS) as used by the conventional trams. In addition, for compatibility with running upon the National Rail network, the tram-trains are fitted with Train Protection & Warning System (TPWS) and GSM-R equipment.[4] While TPWS is to be active during all operations, manual intervention by the driver is required to for the activation of the GSM-R apperatus each time that one of the vehicles enters onto the heavy rail line.[4]

In order for the vehicle to be capable of running on both on-street tramways and the National Rail network, the profile of the wheels were required to suit the particularities of the rails on both systems.[4] The design team collaborated with the University of Huddersfield, to develop a specially-designed wheel that fits both rail head profiles, which is claimed to reduce the rate of wear and mitigate against the risk of derailment. However, as the wheel profile was non-standard, permission had to be obtained from the Rail Safety and Standards Board (RSSB) before the new design could be adopted and subject to real-world testing.[4] As a result of the vehicles being operated upon a heavy rail line, they are subject to higher crashworthiness standards than had been imposed upon the rest of Supertram's fleet, meaning that these units will be the only ones capable of operating the tram-train service to Rotherham.[9][17]


During January 2016, the first tram-train commenced active testing on the Supertram network.[4] During late 2016, it was intended for the first examples of the fleet to enter revenue service upon the existing lines during the first half of 2017.[14] On 14 September 2017, the first Class 399 officially entered passenger service in a ceremony attended by the Parliamentary Under-Secretary of State for Transport Paul Maynard and various transport officials and representatives from Sheffield Children's Hospital.[18][19] 399202 was named Theo, after the mascot of the city's children's hospital charity; in addition, tram passengers who travelled during the next two days made donations to the charity in place of the standard fare.[18]

In addition to their tram-train functionality, the fleet has also been used to strengthen Supertram's existing assets, which has not been previously expanded since having been originally commissioned in 1992. The vehicles have been fully integrated into Supertram's fleet, and are maintained by the manufacturer at the main Nunnery depot.[20] The Rotherham service operates every 20 minutes between Cathedral and Rotherham Central, before terminating at a new stop at Rotherham's Parkgate retail park, with a total journey time of approximately 25 minutes.[11] A total of three vehicles will be required for this service level; three of the remainder will be used to increase capacity on the rest of the network, with the seventh in maintenance.[16]

Initially however, four of the seven vehicles will be dedicated to the Rotherham service, with the other three used for fleet expansion. This is owing to the different wheel profile required for running on National Rail tracks as opposed to Supertram's own. This is envisaged to be the case until Supertram has completed its full track replacement programme.[21] During early May 2018, testing finally began on the tram-train aspects of the vehicle itself.[22] The full Rotherham service started running on 25 October 2018. 399204 was badly damaged after hitting a lorry near Woodbourn Road tram stop on the first day of operation. 399202 Theo was also damaged in a collision on the 30th November at the same junction. [23]

On 9 April 2019 a fault was found[24] with a non mechanical bracket on the undercarriage of the Class 399 units and they were withdrawn from service for two days to undergo safety checks.[25]


  1. ^ Robert Pritchard. "Class 399/0 for Rotherham tramtrain". Today's Railways. Platform 5 (159): 28.
  2. ^ a b "UK approves Tram Train pilot for South Yorkshire". Kable. 21 May 2012. Retrieved 20 February 2015.
  3. ^ Rotherham tram-train to launch this month Metro Report International 4 October 2018
  4. ^ a b c d e f g h i j k l m n o p Johnson, Marc. "Sheffield tram-train: Making square pegs fit." Rail Engineer, 23 December 2015.
  5. ^ Dickins, Sarah. "Analysis: Getting the South Wales Metro." BBC News, 30 June 2015.
  6. ^ Bynorth, John. "New lifeline for multi-million pound Glasgow Airport tram-train link." Herald Scotland, 20 November 2017.
  7. ^ "Tram-Train Trials, United Kingdom". Kable. Retrieved 20 February 2015.
  8. ^ "City tram-trains trial unveiled". BBC News. 15 September 2009. Retrieved 20 February 2015.
  9. ^ a b c "Vossloh España to deliver seven tram trains to SYPTE in UK". Kable. 21 June 2013. Retrieved 20 February 2015.
  10. ^ "First tram-train heads for Sheffield". Railway Gazette. 20 November 2015. Retrieved 20 November 2015.
  11. ^ a b "Tram-Train Frequently Asked Questions" (PDF). South Yorkshire Passenger Transport Executive. Retrieved 2 November 2011.
  12. ^ "Sheffield to Rotherham tram-train scheme delayed by year" BBC News, 8 October 2015.
  13. ^ a b "Sheffield to Rotherham tram-train pilot delayed further." BBC News, 18 May 2016.
  14. ^ a b "Sheffield to Rotherham tram-train scheme delayed further." BBC News, 25 November 2016.
  15. ^ a b "Scathing report on Sheffield-Rotherham tram-train pilot." BBC News, 15 December 2017.
  16. ^ a b O'Connor, Paul (15 August 2013). "Next stop Rotherham: Sheffield's new Tram Trains". The Rail Engineer. Retrieved 20 February 2015.
  17. ^ Hargreaves, James (13 February 2014). "Sheffield to Rotherham tram-train plans". We Love Sheffield. Retrieved 20 February 2015.
  18. ^ a b "Minister launches first Citylink tram train into service." Stagecoach, 14 September 2017.
  19. ^ "Sheffield tram-train enters service." Metro Report International, 15 September 2017.
  20. ^ "Sheffield to Rotherham tram-train delayed". Rail Technology Magazine. 14 November 2014. Retrieved 20 February 2014.
  21. ^ Pritchard, Robert (February 2016). "First new South Yorkshire tram-train delivered". Today's Railways. Platform 5 (170): 28–29.
  22. ^ Cooper, Sam. "Testing finally begins on Sheffield to Rotherham tram-train link.", 10 May 2018.
  23. ^ Rotherham tram-train to launch this month Metro Report International 4 October 2018
  24. ^ "Tram-trains suspended after fault found". 10 April 2019. Retrieved 14 April 2019.
  25. ^
  1. ^ "Minor Timetable Changes". Retrieved 25 October 2018.