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Embankment Support for a Railroad Track: Construction Report

This report discusses the construction of three non-conventional railroad track support structures. These non-conventional structures, which include a continuously reinforced concrete slab, twin cast-in-place concrete beams, and twin precast concrete beams, are part of a program to develop...

Tunneling Cost Analysis

This report provides the Office of High Speed Ground Transportation with a review and analysis of tunnel construction costs. The data for all cost analyses in the report were obtained from historical records of tunnel owners, contractors, and equipment and material manufacturers throughout the...

Preliminary Vibration Measurement on Mark I Vehicle

Preliminary measurements have been made on the acceleration and vibration environment of the Mark I vehicle while operating on the New York City Transit System. Measurements at the journal box indicated short period high acceleration pulses as large as 120g with durations of about one milli-...

Embankment Support for a Railroad Test Track: Design Studies

The events and considerations leading up to the production of an embankment design for the support of the Kansas test track are described. Included are discussion of: site description, field investigations, laboratory investigations, sub-surface conditions, embankment design, and instrumentation...

Tracked Air Cushion Vehicle Systems

The tracked air cushion vehicle is one of several advanced ground transportation systems being studied by TRW Systems Group for the Department of Transportation as a possible means of providing safe, high-speed, high-capacity transportation along densely populated areas such as the Northeast...

Heat-Assisted Tunnel Boring Machines

A study was performed to determine: a) the increase in tunneling machine performance in hard rock resulting from heat weakening of the rock in advance of the tunneling machine, b) the increase in hourly cost incurred by the heating system, and c) the net effect of the increased performance and...

Northeast Corridor Transportation Facts and Statistics

The material presented in the document is meant to provide basic information on the intercity transportation system and other select regional characteristics of the Northeast Corridor. Primary attention is given to the status of the existing transportation system and the magnitude and...

Review of Effects of Hypervelocity Jets and Projectiles on Rock

New methods are being continuously sought which will radically increase the rates of tunnel excavation. Attention has turned to the use of hypervelocity impact as a means of cutting and breaking rock, as well as the use of lasers, electric current, explosive drilling, high frequency vibration, etc...