GKRT0075 Iss 5

This document specifies the Minimum Signalling Braking Distance (MSBD) and Minimum Deceleration Distance (MDD) for lineside signal spacings and the signing of permissible speed changes. MSBD and MDD are parameters that support technical compatibility between the lineside signalling systems and rail vehicles.

This is a revised document containing the material from GKRT0075 issue four and GKGN0675 issue four that is within scope of Railway Group Standards, with two additional requirements setting out methodology for determining MSBD and MDD on steep falling gradients.

12 month review - No further action required.

26/06/2025 - CCS SC at its meeting in May 2025 approved the 60m review recommendation that a point release be published to update references and out of date terminology. 

Optional reading and resources:

Where do we use standards? Control, Command and Signalling