APTA PR-E-RP-017-99
27-Point Control and Communication Trainlines for Locomotives, Locomotive-Hauled Equipment and DMUs
Abstract
This document defines recommended practices for 27-point MU control and communication trainlines, including functional hardware and interfaces on the vehicles with circuit functions, for use on new/rebuilt locomotives, locomotive-hauled vehicles and DMUs.
Keywords: 27-point, communication trainline, control command, digital trainline, MU trainline, trainline
Summary
This recommended practice defines the functionality of 27-point MU and communication trainline systems, as well as their application to passenger cars, locomotives and DMUs.
Document History
| Document Number | Version | Publication Date | Publication | Related Information |
|---|---|---|---|---|
| APTA PR-E-RP-017-99 | Rev. 2 | 05/13/2026 | Published | Current |
| APTA PR-E-RP-017-99 | Rev. 1 | 03/22/2004 | Published | Superseded |
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