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The resources module contains various non-source-code files used by JMRI classes. See the COPYING file for the license. Icon-like images are organized by size, e.g. in directories with names like: images19x16 images128x128 This is done to group interchangable images together: There are usually artifacts when an image is replaced by one of a different size, so its better to use ones of a single size for the various states of a control, etc. Names of individual files are meant to be robust (no spaces, case should not be a distinguishing characteristic) and descriptive: redX.gif greencheck.gif At some point, files might be made available to users alphabetically. It is therefore better to organized the names so that related files are close together. E.g. CtcTurnoutPlateLeft.gif and CtcTurnoutPlateRight.gif rather than RightTurnoutCtcPlate.gif and LeftTurnoutPlateCtc.gif Put colors, directions, etc, at the right end of the names.