Upgrading of the rail vehicles is in line with the policies of the Iran's twenty-year development vision document (Horizon 1404) in order to increase the share of railways in the transportation of goods up to 30%. The design of freight wagons with higher axial load, provides the possibility of increasing the load carrying capacity of the wagons, helps to achieve environmental goals through less CO2 emission, and causes a significant reduction in the transportation cost, which itself leads to more investment by the private sector in the Iran's rail vehicles. This paper presents a computational platform to analyze the mechanical strength of a long-sided freight wagon with an axle load of 25 tons, according to the requirements of EN 12663-2 standard, using the finite element method. Design requirements are described in detail and appropriate numerical models are developed for each requirement. The results of the simulations performed in all loading conditions have been compared with the limits defined in the standard and the correctness of the design has been ensured. Numerical results depict that among all load cases, lifting at one end, lifting the whole vehicle (load cases LC6 and LC7) and compressive force and vertical load (load case LC8) cases are the most sever ones, and induce higher local stresses; which could be reduced by reinforcing or making some geometrical changes in the underframe. In general, the outputs of this research will help the railways engineers to identify and optimize the high stress regions of the freight wagon underframe, under different loading conditions. Such modifications, not only optimize the weight and increase the strength and the load carrying capacity of the wagon, but also increase its useful life time and operational reliability.

Rail profile irregularities are one of the main vibration sources to vehicle and track. In this paper derailment of a wagon moving on cable-stayed bridge due to rail irregularities is investigated. The four-axle wagon model is a three-dimensional, non-linear model of a train freight car with 38 DOF. Two parallel rails of the track are modeled as Euler-Bernoulli beams on elastic points as rail pads. The bridge deck is modeled as a plate supported by some cables. Using this model; the effects of wagon specifications, lateral position of the rails and rail irregularities on wagon derailment have been studied.

Productivity is an important issue in Key Performance Indicators of Rail Transportation. Comparison shows that Freight Wagon Productivity is less than Pioneer countries. It is possible to multiple it in future years gradually. With Increase in Freight Wagon Productivity, Rail Freight Share and Attraction of Investment will be increased and National Economy uses its considerable benefits. With Review of Previous Studies, Suggested Method for Analyzing of Freight Wagon Productivity with unit of “, Speed”,is proposed in National Level. Status of Freight Wagon Productivity has reviewed for last years in National and Corporate Level. For Next Future 20 Years, Quantitative Goals in 4 Program of 5 Years is proposed mainly according to increase of existing asset Productivity. Because mentioned Indicator is important in Rail Freight Productivity and increase of it can show a kind of progress in Productivity of human resources, Rail Infrastructure and even Diesel Locomotives, and because of Simplicity and Not Complexity in Supervision by Related Authorization Organizations, it Suggests that in First Step it establish and pass and submit by National Parliament with respect to specified method explained in this article and Specific Quantities Goals. It can be used for interaction of Parliament with Transportation Minister and also Transportation Minister can be using it in interaction with Managing Board of Iranian Railway State Co. (RAI).

The aim of this paper is ride quality analysis of rail vehicles in the straight line rely on EN and UIC methods. To achieving this goal, a 9 degree-of-freedom (DOF) ride dynamic model of wagon has been described. The ride dynamic model of ERRI benchmark vehicle simulated in SIMULINK toolbox that its inputs were class 3 and 6 of USA railway. Wagon’s dynamic response versus different longitudinal acceleration has been obtained. The ride comfort index calculated in MATLAB software. The results show that the ride comfort index increases as a function of starting longitudinal acceleration, especially in standing passenger. The point B ride comfort index (corner of wagon) is greater than point A (midpoint of wagon). This difference is very sensible in low quality track, because roll and pitch acceleration of car-body in point B are much greater than point A. At same acceleration, ride comfort index value in standard method was lower than full method for standing passenger. Full method should be using for evaluation of ride comfort in metro wagon standing passengers.

Switches in railway tracks have discrete and complicated structures. Therefore these points are one of the most dangerous parts of a railway track. As an operational and maintenance approach it is important to evaluate and predict derailment probability in these points. As a train-track interaction problem, this phenomenon is influenced by switch geometry, switch structure and dynamic characteristic of railroad vehicle like velocity and axle load. Therefore it is important to run analyses that contain these factors and be able to evaluate the vehicle derailment phenomena. In this research, evaluation of the effective parameters on derailment of a wagon is presented considering the results of vast sensitivity analyses. For this goal, dynamical modeling of the chosen both freight and passenger wagons in a switch track using ADAMS/RAIL is developed and the effects of the switch geometry, switch structure and operational parameters of the vehicles are studied in derailment. The results showed that track gauge as well as speed had the most impacts on derailment while the even track stiffness changed the results less than 4 percent.

Wagons are one of The Valuables Assets in Railway Networks. Boosting Trade Speed which caused by Exact Wagon Tracking, In One Hand Acquire Customer Satisfaction in Supply Chain and in Other Hand Result in Decreasing Capital Cost and Increasing Productivity then Finally Make Railways Investment justified. We Aim to introducing The Current Procedure in Fleet Tracing, Advantage and Disadvantage of Each Methods, Calculate the Cost and Effect of Humane Errors, Necessity of Implementing Modern Methods for Wagon Tracking and Eventually Determine the Best System of Wagon Tracing in IRI Railway Network by means of Concordance Analysis Approach. For This Purpose, We measured Five Options in Twelve Criteria’s. It is Necessary to Mention that This Research in Context of Automatic Wagon Identification is Novel in the Country and yet not to be done. The Output of The Study Show That Installing the GPS Module on Each Wagon is the Best Method for Wagon Automatic Identification in Iran Railway Network.

This paper presents the design and development of a hybrid power supply system for freight railway wagons, aiming to enhance energy autonomy and reduce maintenance requirements. The system utilizes solar energy and rechargeable batteries as primary power sources. An ESP32 microcontroller serves as the central unit, managing energy resources, battery charging and discharging processes, and protecting the connected loads. Additionally, the design includes voltage regulation circuits, current protection mechanisms, and voltage and current sensing modules to ensure precise monitoring and stable operation of the system. Simulation and experimental results confirm the high reliability of the system under various operating conditions and its ability to provide continuous power to the wagon's onboard loads.

The nonlinear effects of the second harmonic generation have been investigated for the propagation of light along the axis of fibers of wagon wheel cross sectional shape. Nodal finite element formulation is utilized to obtain discretized Helmholtz equations under appropriate boundary conditions. The hierarchical p-version nodal elements are used for meshing the cross section of wagon wheel fiber. The fiber material has been chosen to be LiTaO3 to provide proper second harmonic generation. Propagation of generated second harmonics for two incident field amplitudes are studied in this work.

Rail irregularity is one of the most effective factors in train derailment. theste irregularities have generally random distribution that are assumed to be stationary random and ergodic processes in space, with Gaussian amplitude probabiliy densities and zero mean values. The quality of irregularities, their distribution along the rails and wagon speed are the main factors for train derailment which is investigated in this article. The car model is nonlinear and three-dimensional with 48 DOF. Using simulation results, the safe speed for moving wagon on different types of random rail irregularities is also determined.

Public transportation has always been of great interest to researchers and has been considered an essential and efficient method for transporting people and various goods over the past two centuries. In recent studies, the examination of influential parameters on the efficiency of these vehicles has played a prominent role, and numerous researchers have continuously investigated the safety and various parameters of freight wagons. One of the challenges that can be raised as an issue in standard open-top freight wagons is the placement and positioning of the load inside these wagons. Considering that loading these wagons is not standardized in the industry and the load may be placed more or less in different positions at each loading stage, examining the effect of this issue on the safety of the movement of wagons in a curve can be essential. In this study, by considering a standard open-top freight wagon in the Universal Mechanism software, the effect of placing a hypothetical concentrated load in four different positions on the derailment coefficient in a curve with three different non-critical speeds is investigated. Ultimately, by comparing the results, the effect of this parameter on the derailment coefficient is discussed. The focus of this study was solely on the safety of the wagon's movement.