OBJECTIVE This study evaluated the prevalence of, and the risk factors for, obstructive sleep apnea syndrome (OSAS) among Brazilian railroad workers. METHODS Male railroad workers (745) from a railway company in Brazil were analyzed after responding to questionnaires about their demographics, sleep habits, excessive daytime sleepiness (Epworth), and the likelihood of having apnea (Berlin). We...

This reasearch studies ACO algorithms for the switch engine scheduling in a Railroad Yard. The cars are moved individually or grouped into blocks by a set of locomotives called switch engines which are dedicated to moving around the cars in the yard. The need for moving comes from the fact that the arriving trains are disassembled into blocks of cars, undergo some operations like, loading , unl...

Abstract The Qinghai-Tibet Railway has been operating safely for 16 years in the permafrost zone and railroad subgrade is generally stable by adopting cooling roadbed techniques. However, settlement caused degradation of embankment-bridge transition sections (EBTS) one most representative severe distresses. A field survey on 440 bridges (including 880 EBTSs) was carried out employing terrestria...

Prashant Sharma*, V M S R Murthy** Avinash Paul***& Ajoy Kr Singh*** *3 year Student, Bachelor of Technology in Mining Engineering, Indian School of Mines, Dhanbad826 015, India Contact No. +918092633969, +918871601404; Email: [email protected] **Professor, Mining Engineering Department, Indian School of Mines, Dhanbad826 015, India ***Scientist, Central Institute of Mining and Fuel...

Recent Changes to the Railroad Retirement Act* The Social Security taxes shown are the employee taxes only and are derived by applying the combined OASDI and HI tax rates in the present law to the projected earnings amounts. The Federal income taxes shown are approximate and are based on a summary of the provisions of The Economic Recovery Tax Act of 1981 (Public Law 97-34). For the years 1985 ...

A panel of individuals with expertise in the railroad industry provides an overview of Simulation within the Railroad Environment. The panelists discuss their work and highlight the issues, challenges, and benefits associated with application of simulation models. Topics presented are; • Model Development, the issues and challenges. • Role of Dispatch Model in Mainline Capacity Studies. • Benef...