["< sod > the'''blue mountain quarry'''( first introduced in'' [ [ blue bird mountain mystery ] ]'' ) is a rather large slate quarry, located on one of the narrow gauge lines of southern the skarloey railway. < eod > < sod > the'''our blue mountain quarry'''( first introduced introduced in'' [ [ southern blue mountain mystery ] ]'' ) is a large slate quarry, located on one of the narrow gauge power lines west of the skarloey railway. it is also not served by a standard gauge branch line that faces breaches of the peel godred line. < eod >"]