Currently sorting out the various private sidings north of Beaudesert township and so far I think the key is the Helen St level crossing which is shown on the 1950 level crossing list as 46 miles 73 chains. Thus Lahey’s sawmill points, 46 m 71 chains, was two chains north of the Helen St level crossing, Buchanan's Siding, 47 m 2 ch, was 9 chains south of the Helen St level crossing and the milk factory, 47m 16 ch, was 23 chains south of the Helen St level crossing. There was a water pumping plant at the 46 mile site. This had a stationary loco and was mentioned in the 1962 ARHS Bulletin article. That pumping site would be 73 chains or 1606 yards north of the Helen St level crossing. Hairyleg has a small red spur there but no mention in John Kerr’s notes but it is mentioned P.24 of Destination South Brisbane.
Imperial Measurement conversion; The British imperial measurement system used miles and chains. 1 Mile is 1.61 Kilometres. There are 80 chains in a mile. One chain is 66 feet or 22 yards or 20.12 metres. A standard cricket pitch is one chain long.