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This machine, manufactured by Lloyds British Somers (formerly Somers Railway Engineering) in Halesowen lifts a 3 car underground train (half of a full train).

The 12 jacks are synchronised by a plc
(programmable logic controller) running software designed by Buswell Machine Electronics Ltd.

The machine includes a separate microcontroller-based safety circuit that monitors the plc control for malfunction. This is to avoid a single-point failure possibility in the plc. Although inherently very reliable, like all electronic devices plc's can and do fail in unpredictable ways.

Synchronised Multi-Jack Lift Controls