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This Truck Mounted Mobile Coal Sampler (TMMCS) with Instant Ash Moisture Analyser as shown in figure 1 ( a,b,c) is for collecting an unbiased coal sample from open railway Wagon/Truck. The coal collected from the loaded Wagon/Truck will provide a true random representative sample (up to 6 feet depth) which would be analysed for quality determination for Ash Moisture to get GCV value. The objective of the project has been successfully fulfilled and the feasibility of the nuclear technique method with Dual-gamma-ray Transmission for analysis of coal ash and moisture content has been established resulting a fruitful outcome. The developed technology has given satisfactory output values of coal ash and moisture content within the permissible range to get instant GCV. The results obtained from the Truck Mounted Mobile Coal Sampler (TMMCS) were validated with the SCCL's laboratory results. The characteristic curves were drawn separately for ash% and moisture% for SCCL laboratory results as shown in figure 2 and figure 3 below respectively and the same was compared with the nature of the curves obtained from TMMCS's results. After comparison it was observed that the both results are in good agreement with each other. The natures of the curves are completely similar. It shows the true compatibility of both the results.