Technical Reports

High Productivity Integral Train Program - Iron Highway Phase II Evaluation

  • 01
  • Nov
  • 1995
AUTHOR: F. D. Irani
OFFICE: RPD
REPORT NUMBER: R-888
SUBJECT: Evaluation
KEYWORDS: Single Axle Suspension, Independently Rotating Wheels, Distributed Power
ABSTRACT: Evaluation tests of Iron Highway Phase II prototype show that the technical benefits predicted from the integral train design are attainable. The tests prove that the control and braking, loading and unloading, split ramp and platform suspension systems are ready to be engineered into production equipment The power system requires further development. The acceleration measurements during the dynamic tests show that the load bearing platforms provide a comparable or better ride than existing intermodal equipment with the exception of vertical bounce response. Further analysis will be made by the proponent to tune the suspension for a better vertical ride. Based on measurements taken in a 12-degree curve and a spiral leading to a 10-degree curve, Wheel/rail forces show improved curving compared to any existing intermodal equipment Response measurements of the power and control unit and its suspension show no derailment tendencies, but do suggest improvements can be made for better human ride comfort. The control system tests indicate that the central traction computer software is functional and provides accurate and repeatable commands for proper control and monitoring of the system. Power system tests were not conducted due to failures in the differential gear box sub-systems. Limited brake system tests demonstrated successful operation in blended, full service and emergency braking modes. Tests of the split ramp car successfully demonstrated its function. The system allows loading and unloading of fully loaded, non-railroad trailers, up to 53 feet in length. Trailers can be loaded or unloaded at the middle of a consist, at any level gravel surface. Yard facilities are not required. The tests were carried out at the Transportation Technology Center and were funded jointly by the Federal Railroad Administration and the AAR as part of the High Productivity Integral Train (HHT) Program.
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