I noticed on the Bachmann CK E15055 (and similar on other liveried CK's) that one of the windows has a thicker surround, painted into the window glazing on the model.   Assuming this to be prototypically correct, does anyone know why this window is framed in this way. It looks similar to a contemporary 'break-out' window on modern stock.   This can be seen on:   http://www.ehattons.com/26504/Bachmann_UK_39_127C_BR_Mk1_CK_Composite_Corridor_in_Crimson_Cream/StockDetail.aspx   Neal