This is a pre-market engagement exercise for the procurement of Under sleeper pads (USPs).
Network Rail requires the following:
Under sleeper pads (USPs) – USP is a resilient (often elastomeric) layer fixed to the underside of concrete sleepers during the casting process to provide vibration protection and/or preserve the ballast under the tracks and improve track stability.
The contract dates entered below reference the deadline for the pre-market engagement exercise.

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