Parry People Movers Ltd. is a British company manufacturing lightweight trams and railcars that use flywheel energy storage to store energy for traction, allowing electric systems to operate without overhead wires or third rails, and railcars fuelled by small gas, diesel or hydrogen engines.
Current usage
, owner of the West Midlands franchise, began operating a single PPM50 unit on the Stourbridge line on Sundays in 2006, with a Class 153diesel multiple unit providing a weekday service. In June 2009, the Class 153 was replaced by two PPM60 units, classified as Class 139, providing a 10-minute frequency in both directions. Although the capacity of the unit is less than the DMU, overall capacity is increased due to the greater frequency, up from 4 to 6 trains per hour. The trains were transferred to West Midlands Trains, operating under the West Midlands Railway brand, when the West Midlands franchise was refreshed in 2017. From 24 January 2011, Go! Cooperative planned to be operating a trial service between Alton and Medstead & Four Marks on the Mid-Hants Railway using the Class 999 unit. This was abandoned after a series of mechanical and electrical failures and due to the unit proving to be unsuitable for the long and steep gradients on the line the unit is now being reconfigured to address the problems with a redesigned chassis and conversion from LPG to Diesel power and the trial will be repeated. In January 2012, plans emerged for new bigger PPMs to be used on the South Staffordshire Line between Stourbridge Junction and Brierley Hill, providing passenger services on the line for the first time since the Beeching Axe.
Earlier trials
Prior to entry into commercial service, testing took place on the Severn Valley Railway in March and April 2002 with a PPM50 unit operating between Kidderminster and Bewdley. The Parry flywheel storage technology was tested on the Stourbridge Town Branch Line in the West Midlands in 2006. Since Central Trains had no Sunday service on the branch, the initiative was brought to test a PPM50 model at that time, with a view to replacing the Class 153 single-car Diesel Multiple Unit that previously worked the Branch with a unit with much lower operating costs. The trial lasted for a year. Parry People Movers have also been demonstrated on narrow gauge railways.
Technology
PPMs utilise a rotating flywheel as a store of kinetic energy which is then used to power the vehicle. A typical PPM flywheel is made from steel laminates, approximately in diameter and in mass, designed to rotate at a maximum speed of 2,500 rpm. The flywheel is mounted horizontally at the centre of the unit, beneath the seating area. The flywheel is driven by an internal combustion engine or an electric motor. The flywheel is connected to the rail wheels via a hydrostatic variable transmission system. The wheels are driven without conversion into electricity as many other railcars utilizing flywheel enegy storages do. The flywheel allows the direct capture of brake energy and its re-use for acceleration. When the vehicle brakes, the hydrostatic transmission feeds the energy back into the flywheel. Since the short-term power demand for acceleration is provided by the energy stored in the flywheel, there is no need for a large engine. A variety of small engine types can be used including LPG, diesel or electric traction. On a route with stations a short distance apart it is theoretically possible to use the unit as a tram without any engine or overhead electrification at all. Instead the flywheel could be re-energised at each station storing enough power to carry it on to the next.
Fleet
In April 2019 Parry People Movers announced plans to upgrade the original Class 999 PPM50 prototype with a diesel power unit and to seek approval for its entry into passenger service as 'No 139000'. In February 2020 the refurbished vehicle was moved to the Severn Valley Railway for testing.
