USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

eLibrary

eLibrary
Subscribe to RSS

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...

Design of Tunnel Liners and Support Systems

Contents: Introduction; Fundamentals of tunnel support design; Existing theories, design methods, and practices; Tunnel support systems in soil and soft rocks; Tunnel support systems in rock--Factors influencing behavior; Tunnel support systems in rock--Design procedures; Potential developments of...

Analysis of Optimum and Preview Control of Active Vehicle Suspensions

The analysis leading to the optimum transfer function for an active suspension excited by a random guideway input is briefly reviewed and a design chart is presented. A parameter sensitivity study of the stability is performed and shows excellent system stability. The wheel-guideway contact problem...