Software system comprising computer hardware and software for validating movement instructions for an on-track railway vehicle by issuing safety-critical movement and restriction instructions to an on-board computer of the on-track railway vehicle and receiving feedback regarding the on-track railway vehicle status and position to ensure safe movement of the on-track railway vehicle

'board':32 'compris':3 'comput':4,33 'critic':23 'ensur':55 'feedback':43 'hardwar':5 'instruct':11,27 'issu':20 'movement':10,24,57 'on-board':30 'on-track':14,36,46,60 'posit':53 'railway':17,39,49,63 'receiv':42 'regard':44 'restrict':26 'safe':56 'safeti':22 'safety-crit':21 'softwar':1,7 'status':51 'system':2 'track':16,38,48,62 'valid':9 'vehicl':18,40,50,64

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