Ragnar Hedström


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Research results from Ragnar


Innovationsupphandling och implementering av komplexa signalsystem: arbetsprocesser och...

The aim in this project was to identify problems and needs associated with innovative signal system procurement procedures. The project was based on the client organisation’s ability to achieve the goals of functionality, time and budget. A...

Säkerhet och arbetsmiljö vid väg- och spårarbeten: implementeringsprocessen av nytt...

The purpose of this study was, through the use of interviews, case studies, and a reference group meeting to describe and analyze the implementation process of new and revised regulations. This applies to both road and track in their administrative...

Bankonstruktionens egenskaper och deras påverkansgrad på nedbrytningen av spårfunktionen

The main objective of the report is to identify the characteristics that influence the degradation; defined as the condition change, of the super- and substructure of the railway construction. The objective is also to rate the degree of influence of...

Säkerhet vid väg- och spårarbete: en intervjustudie

There are rules and regulations that govern how working environment and safety are considered for road and railway works, but despite this a number of accidents and more or less serious incidents happens every year. To get an idea of how safety and...

Genomförda utredningar och försök med längre och tyngre tåg i Sverige

The purpose of this report is to give an account of the studies and tests carried out in Sweden with longer and heavier trains since the early 1990-ties. The material for this report is based on investigations carried out by the Swedish Rail...

Cykling och gående vid större vägar: några aspekter på anläggning, drift och underhåll...

The aim of the study is to review various aspects regarding construction, maintenance, management and costs for pedestrian and cyclist solutions on major roads, with or without central barrier, where the permitted speed limit is between 70 and...

Spårburen kollektivtrafik i Linköping: förslag till en implementeringsmodell

The new Master Plan for the City of Linköping and the included Transport Strategy discuss a high quality public transport network in the city, the so-called LinkLink. High quality public transport is seen as an important part of the city and...

Spårvägssäkerhet: metoder för minskning av sannolikheten för vissa typer av kollisioner i...

This is the final report on the project "The safety of trams - methods for lowering the probability of certain types of collisions in tram traffic." Tram traffic and road traffic are two transport systems which must operate in the street zone under...

Miljöeffekter av 30 km/h i tätort - med avseende på avgasutsläpp och buller: en förstudie

This preliminary study describes a project the aim of which was to increase knowledge of the overall environmental effects with regard to exhaust emissions and noise in conjunction with a lowering of the speed limit from 50 km/h to 30 km/h in urban...

Light rail - light cost: A preliminary study

This report describes a project intended partly to survey the need for multidisciplinary competence in the fieldof light rail transport and partly to determine whether there is a possibility and a need for expanding light railtraffic in Sweden as a...