This study aims to analyze the improvement of the operational performance of Indonesia’s Soekarno-Hatta Airport train through service quality which is mediated by train passenger loyalty and passenger satisfaction. The main problems in this study are the use of the same railway for long-distance train, airport train, and commuter Line train, the limited use of airport railway with four schedules, the headway which becomes 30 minutes since the number of travels becomes 82 trips, and the tariff being applied now is considered as burdening the passengers. The research method uses a quantitative analysis approach with the technique of Structural Equation Modeling-Lisrel. Data collection is done through observation and questionnaire distribution. The respondents are 306 passengers of trains heading for Soekarno-Hatta Airport. The benefit of this study for the domestic railway company is that by improving service quality, passenger loyalty and satisfaction, it will improve the operational performance of airport trains. The result of this research indicates the significant influence of service quality variable on passenger loyalty through passenger satisfaction, the significant influence of service quality variable on operational performance through passenger satisfaction and passenger loyalty as well as the significant influence of passenger satisfaction variable on operational performance through passenger loyalty.

Padalarang - Purwakarta line track is a very crowded but potential track since it connects Jakarta - Bandung. Argo Parahyangan train and freight train are passing through this track. Therefore, it is crucial to build double track lane. However, it is difficult to execute due to a wide and deep river which requires a new bridge with a complex high cost construction. That is the reason why, an in-depth evaluation of the bridge design is needed. In selecting the bridge design, the Analytical Hierarchy Process  was used as the selection method. The method would applied a four-level developed structure: the first level was the goal of choosing the Optimum Bridge Design, the second level was the people involved, the third level was the evaluation criteria, the last level was the alternative bridge to be built. The data was taken from the questionnaires filled by six respondents of the railway bridge's construction experts. The results show that the order of the bridge's design selection is as follows: 0.395 for concrete bridges; 0.213 for steel arch bridges; 0.199 for steel frame bridges; and 0.194 for cable bridges.

This research aimed to understand the marketing mix implemented by the Cargo Transportation Unit of Kereta Api Indonesia Daop 6 Yogyakarta, Indonesia, and to study and know its position. The main problem was that many cargo transportations used the service handling system of Door-to-Door, which was relatively cheaper than cargo transportation using a train that still implemented the Station-to-Station service. The research method used the Boston Consulting Group matrix to know the market growth, market share, and quadrant position of Kereta Api Indonesia Daop 6 Yogyakarta. The collected data were then analyzed using the calculation of Market Growth Rate, Relative Market Share, and Boston Consulting Group Matrix. From the Market Growth Rate calculation, the result was as much as 8.5%, and from the total Relative Market Share, the result was 0.5 < 1. Furthermore, based on the Boston Consulting Group matrix, Quadrant IV (Dogs) shows alternative strategies to implement: Divestment, Retrenchment, and Liquidation. The main factor causing the low market growth of the Cargo Transportation Unit of Kereta Api Indonesia Daop 6 Yogyakarta is a crucial finding of this research.