Until dieselisation was completed, every Wednesday without fail, an old Brakevan fitted with a screw handle devise mounted in the middle of the van connected to a reverse belt driven axle that hung under the Van and fitted with two large coarse wire brushs that sat over each rail was run from Lithgow to Wallerawang on the local shunter.
A signal branch labourer would lower the Brush fitted axle when the train entered the Marrangaroo tunnel so that the brushes would sweep any ash,soot and sand from the rail head as it went.
On arrival at Wallerawang, the van was detached and was returned to Lithgow, sweeping the UP main as it went back.
One day due to heavy traffic, the return of the sweeper van was severely delayed causing the labourer to be on well over 12 hours and no forecast of how long it would be before the van could leave so they had to contact the CTM (Chief Traffic Manager), it was than after 8pm to get permission to cancel the van that day and run it the next day.
After the long strike by Loco in the mid 80's over the removal of the Brakevans, Light engines were run through any areas where track circuiting/automatic signaling was in use to remove any film on the rail heads that might stop the signals functioning.
Note that this area is not electrified so the cleaning was for the operation of the signaling system only.
Prior to opening the Sydney Light Rail system, would they run a 'Profile Train' through to get the rails both clean and angled correctly?