Presently the rail transit system plays a major role in the commercial world that they currently use diesel engine not only causing to a lot of fuel consumption but also generating numerously pollution. Therefore this project aims to study the break-even point of investment under comparison of brake specific fuel consumption and pollution of locomotive engines. By experimental works there are 3 types of locomotive engine: Pielstick M.T.U. and Caterpillar which are the difference of the combustion chamber and the fuel injection systems. The simulation load on the static tests (Dynamometer) was used following the regulation characteristic curve which is standard of State Railway of Thailand. As a result of testing the engine using common rail type of fuel injection system M.T.U. was the lowest brake specific fuel consumption at all of engine by the average of all engine speed 206 g/kW-h of brake specific fuel consumption. It is lower than Caterpillar (Semi common rail with direct injection) which is 314 g/kW-h equivalent 34.39 % while Pielstick engine a mechanism fuel injection system is 389 g/kW-h equivalent 47.04 % For pollution area there are Hydrocarbon (HC) Nitrogen Oxide (NOX) and black smut. The engine with direct injection system relieved the previous substance less than the pre-combustion engine. Moreover the compound of carbon monoxide (CO) was found that the pre-combustion engine (Pielstick) discharged carbon monoxide (CO) less than the direct injection engine (Caterpillar) whereas the common rail engine emancipated same substan cenear by with the pre-combustion engine (Pielstick). However the new technology of the engines is high maintenance costs. Therefore a number of applications have to be needed to make a quantitative value for the investment.

The research aimed to examine a relationship between the attitude towards Career and Technology Learning of the upper secondary students from Srinakharinwirot University Prasarnmit Demonstration School (Secondary) and factors ; both personal factors and supportive factors. The sample of this study was 263 the upper secondary students from Srinakharinwirot University Prasarnmit Demonstration School (Secondary) using divided sampling level for this research. The data were collected by the questionnaire and were analyzed using descriptive statistics and inferential statistics. The results of the study are these following ; 1) The attitude towards Career and Technology Learning of the upper secondary students from Srinakharinwirot University Prasarnmit Demonstration School (Secondary) was at a moderate level. 2) Grade level grade point average teaching method class material and environmental factors were correlated to the attitude towards Carreer and Technologhy learning of the upper secondary students from Srinakharinwirot University Prasarnmit Demonstration School (Secondary) at .05 level significantly. However gender was not related to the attitude towards Carreer and Technologhy learning of the upper secondary students from Srinakharinwirot University Prasarnmit Demonstration School (Secondary).