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There is an APTA Recommended Practice 13. APTA PR-E-RP-014-99: Recommended Practice for Diesel Electric Passenger Locomotive Blended Brake Control <a href="https://www.apta.com/resources/standards/Documents/APTA-PR-E-RP-014-99.pdf">https://www.apta.com/resources/standards/Documents/APTA-PR-E-RP-014-99.pdf</a> The paper recommends a substitutional type of system where the maximum blended braking force equals that of the friction only system. A second system is supplemental were the blended braking power exceeds the friction only system. A supplemental type system should be used only to meet unusual railroad physical characteristics. The APTA RP is part of the PRIIA 305-005 specification. So the question remains how much difference remains between full service and emergency application. With the above probagation rates it is 1.4 sec (full service) to 0.7 sec (emergency) Regards, Volker
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