Organizing transportation on a double-track line under conditions of major overhaul on one track

The problem of traffic organization on a railway line during the execution of civil works on super and sub-structures maintenance under the present conditions is becoming more and more difficult to solve, above all, due to the increased traffic intensity. In order to make decisions on indispensable measures to be taken under such circumstances, one needs information on train compositions and their delays, line capacity, facilities, etc. In order to obtain such information, it is necessary to use a computer simulation which significantly enhances the range of the problem to be solved and offers answers to the questions that cannot be solved by analytical models alone. The paper presents a simulation model of the trains’ movement on a double-track line when one track is closed to traffic due to the work executions. Such model will provide a better quality of decision-making in the process of traffic organization under given circumstances

Conditions for simultaneous formation of multigroup freight trains

Formiranje višegrupnih teretnih vlakova predstavlja jedan od kompleksnijih problema željezničkog prometa. Višegrupni vlakovi se sastavljaju od većeg broja grupa vagona koje treba sortirati u kompoziciju prema redoslijedu međukolodvora na pruzi. U radu je prikazana analiza tehničko-tehnoloških uvjeta koji bitno utječu na efekte primjene metoda simultanog formiranja vlakova. Razmatrani su efekti pojedinih metoda značajni za planiranje kolosiječnih kapaciteta i kvalitetu rada kolodvora. Istraživanje u ovom radu doprinosi procesu planiranja u cilju poduzimanja odgovarajućih mjera prije izgradnje kolodvora.The multigroup freight train formation is regarded as a challenging problem in railway transport. Multigroup trains are composed of a number of wagon groups that have to be arranged according to the order of intermediate stations. The analysis of technical and technological conditions that significantly influence the effects of simultaneous train formation methods is presented. The effects of various methods of significance for track capacity planning and train station service level analysis are considered. The research presented in the paper is expected to contribute to the process of planning measures to be taken prior to construction of train stations

Fuzzy renewal theory about forecasting mistakes done by a locomotive driver: a serbian railway case study

The human factor is one of the most dominant causes of railway accidents. For example, human impact appears to be the main reason for 44% of railway accidents in the Republic of Serbia. Thus, a remarkable effort is undertaken to investigate human factors. Therefore, plenty of researchers have analyzed a human influence on railway accidents. This paper develops a model for forecasting the number of railway accidents caused by the human factor. The proposed model is based on the renewal theory and assumes that working time between the faults of a locomotive driver has exponential distribution (or another Erlang distribution of a higher order) characterized by parameter λ that is treated as a fuzzy dependant variable and considered as a function of job complexity, the exposure of locomotive drivers (i.e. time spent in driving) and a tendency of locomotive drivers to make mistakes. The application of the model to the population of 777 Serbian railway locomotive drivers provided encouraging results in predicting the number of railway accidents

Stereotipi prema pripadnicima policije

U radu je prezentovano istraživanje sprovedeno početkom 2018. godine, na uzorku od 104 ispitanika, studenta Kriminalističko policijskog Univerziteta u Beogradu (N=34), Medicinskog fakulteta (Odsek za specijalnu edukaciju i rehabilitaciju) u Novom Sadu (N=35) i Filozofskog fakulteta (Odsek za psihologiju) u Novom Sadu (N=35), od kojih je 24 bilo muškog pola, a 77 ženskog pola, starosti od 18 do 31 godine. Osnovni problem istraživanja odnosio se na pitanje, da li postoje razlike u autostereotipima i heterostereotipima prema pripadnicima policije, kao i da li postoji razlika u autostereotipima i heterostereotipima između muškaraca i žena unutar ciljnih grupa. Autostereotip je određen na osnovu najčešće biranih osobina pripadnika policije, od strane studenata Kriminalističko policijskog Univerziteta, a heterostereotip na osnovu najčešće biranih osobina pripadnika policije, od strane studenata Medicinskog i Filozofskog fakulteta. Za ispitivanje stereotipa koršćena je modifikovana verzija Kac Brejlijeve skale, koja je sadržavala 48 osobina tipičnih za ljude određene profesije. Svaka od 48 osobina je procenjena kao pozitivna ili negativna. Skalu pozitivnih osobina činilo je 25 osobina. Pouzdanost ove skale je zadovoljavajuće visoka α = .81 i izražena je koeficijentom interne konzistencije. Skalu negativnih osobina činilo je 23 osobine. Pouzdanost ove skale je takođe zadovoljavajuće visoka α = .85, i izražena koeficijentom interne konzistencije.Rezultati istraživanja su potvrdili postojanje razlika u autostereotipima i heterostereotipima prema pripadnicima policije, kao i nepostojanje razlika u autostereotipima i heterostereotipima između muškaraca i žena. Rezultati pokazuju da studenti Kriminalističko policijskog Univerziteta imaju više izražene pozitivne i manje izražene negativne stavove u odnosu na studente Filozofskog i Medicinskog fakulteta, koji imaju najizraženije negativne i najmanje izražene pozitivne stavove prema pripadnicima policije. Najčešće pripisivane pozitivne osobine pripadnicima MUP-a su hrabri, samouvereni, sposobni, snalažljivi i oprezni, a najčešće negativne osobine su podmitljivi, hvalisavi, nervozni, nagli (žustri) i uobraženi

Multicriteria decision-making in railway route planning and design

U radu je prikazana metodologija izbora trase u procesu planiranja i projektiranja željezničke pruge koja se temelji na metodama višekriterijskog odlučivanja. Predložena metodologija omogućava cjelovito i sustavno rješavanje ovog problema, čiji krajnji rezultat je prijedlog najpovoljnije trase u skladu s usvojenim kriterijima i realnim ograničenjima. Razvijena metodologija je bazirana na metodi kompromisnog rangiranja (VIKOR), a njena verifikacija provedena je na primjeru izbora jedne od četiri varijante trase željezničke pruge na dionici Koridora X, između stanica Inđija i Novi Sad.The route selection methodology, based on multicriteria decision-making and applied in railway route planning and design, is presented in the paper. The proposed methodology enables an integrated and systematic resolution of this problem, and it results in the most favourable route proposal based on predefined criteria and real-life constraints. The technology is based on the compromise ranking method (VIKOR), and it has been checked during selection of one out of four railway route alternatives on the Corridor X, between Inđija and Novi Sad train stations

Fuzzy multicriteria decision-making in railway infrastructure planning and design

U radu je prikazan pristup neizrazitog višekriterijskog odlučivanja u procesu planiranja i projektiranja željezničke infrastrukture koji omogućava cjelovito i sustavno rješavanje problema postojanja faktora neizvjesnosti i neodređenosti prilikom procjene vrijednosti kriterijskih funkcija. Predloženi pristup višekriterijskog odlučivanja je predstavljen u okviru metodologije za izbor najpovoljnije trase dvokolosiječne željezničke pruge. Za vrednovanje varijantnih rješenja trase u radu su upotrebljeni trouglasti neizraziti brojevi, a za rangiranje je primijenjena neizrazita VIKOR metoda.A fuzzy multicriteria approach in the railway infrastructure planning and design, enabling an integrated and systematic solving of uncertainty and indeterminacy problems in the evaluation of criteria functions, is presented in paper. The proposed multicriteria decision making approach is presented in the scope of the methodology for selecting the most favourable route of a double track railway. Triangular fuzzy numbers are used to evaluate variant solutions, while the VIKOR fuzzy method is used for route ranking

Tehničko-tehnološke prednosti železničkog transporta sa aspekta održivog razvoja

Economic development of last few decades consequently distorts environment on the global level. Economy concept based on emphasized consumer society has brought environmental protection into question. Further growth of production and resources exploitation can cause reducing natural resources to its minimum level. Affirmation and acceptance of sustainable growth philosophy in all economic sectors can mitigate ecological consequences. Sustainable growth philosophy in transport sector has a key role in the battle for environmental protection. Transport sector responsibility relates to its dependency on nonrenewable energy resources and rising carbon dioxide emission and other pollution sources. Railway transport is considered relatively clean and energy effective. Electrification enables reduction of pollution gasses emissions. In average, railway transport emits tree times less carbon dioxide comparing to road traffic, and five times less carbon dioxide comparing to air traffic. Similar situation is with load transport where railway uses a few times less energy comparing to other transport means. Regarding noise influence on environment, railway has significantly less detrimental effect than above mentioned road and air transport. Railway is also favorable in the aspect of space occupation because it occupies 50% less space comparing to highways. All these characteristics support the consideration of railway as the most acceptable means of transport from the aspect of environmental protection. Still, further development of techniques and new technology application in transport should not be stopped. Further development in railway transport supports sustainable growth philosophy.Ekonomski razvoj ostvaren u prethodnih nekoliko decenija ima za posledicu narušavanje životne sredine na globalnom nivou. Očuvanje životne sredine je dovedeno u pitanje privrednim konceptom koji se zasniva na naglašenom razvoju potrošačkog društva. Dalji rast proizvodnje i upotrebe sirovina može imati za posledicu dovođenje prirodnih resursa do minimuma. Afirmisanje i prihvatanje filosofije održivog razvoja kroz sve privredne sektore omogućava ublažavanje ekoloških posledica. Primena filosofija održivog razvoja u transportnom sektoru ima ključnu ulogu u borbi za zaštitu životne sredine. Odgovornost transportnog sektora proizilazi iz njegove zavisnosti od neobnovljivih izvora energije i rastuće emisije ugljen dioksida i drugih polutanata. Železnički transport se može smatrati relativno čistim i energetski efikasnim. Elektrifikacija omogućava smanjenje emisije štetnih gasova. U proseku železnički transport emituje tri puta manje ugljen dioksida u odnosu na drumski i pet puta manje u odnosu na vazdušni saobraćaj. Slična situacija je i kod prevoza masovnih tereta gde železnica koristi nekoliko puta manje energije u odnosu na druge oblike transporta. U pogledu uticaja buke na životnu sredinu železnički transport ima znatno manje štetno dejstvo nego pomenuti drumski i vazdušni transport. Železnica je povoljna i sa aspekta zauzimanja prostora jer u poređenju sa autoputevima zauzima manje od 50% prostora. Sve ove karakteristike daju za pravo da se železnica smatra najprihvatljivijim oblikom prevoza sa aspekta zaštite životne sredine. I pored svih ovih prednosti železnice koje proizilaze iz njenih osnovnih karakteristika, rad na daljem razvoju tehnike kao i na primeni novih tehnologija transporta ne treba zaustaviti. Daljim razvojem u oblasti železničkog transporta pruža se podrška konceptu filosofije održivog razvoja

Effects of the application of conventional methods in the process of forming the pick-up trains

This paper examines a problem of forming the pick-up trains by conventional methods (the Futhner method and Special method), aiming at establishing basic characteristics of track facilities and values of shunting operations indicators important for evaluation of the effects of these methods application. The problem under consideration has so far not been examined in the literature to a sufficient extent, although in practice it has been proved to be necessary. For this reason, in this work a simulation study has been undertaken the results of which have to give the values and measures for assessing the quality of station/yard operations, as well as the assessment of new-designed station solutions

EFFECTS OF THE APPLICATION OF CONVENTIONAL METHODS IN THE PROCESS OF FORMING THE PICK-UP TRAINS

Abstract: This paper examines a problem of forming the pick-up trains by conventional methods (the Futhner method and Special method), aiming at establishing basic characteristics of track facilities and values of shunting operations indicators important for evaluation of the effects of these methods application. The problem under consideration has so far not been examined in the literature to a sufficient extent, although in practice it has been proved to be necessary. For this reason, in this work a simulation study has been undertaken the results of which have to give the values and measures for assessing the quality of station/yard operations, as well as the assessment of new-designed station solutions