For sliding applications it does not normally require lubricators.
Fill mechanical lubricators (where fitted) and hydrostatic lubricators with the correct grades of oil, ensuring they are not overfilled.
As built the engines had Wakefield mechanical lubricators but Maunsell soon changed these for a sight feed lubricator.
The flange lubricators use condensed steam direct from the auxiliary manifold and when correctly used apply a steady trickle of water to the flange.
We already use remote monitoring systems to measure such things as wheel condition or the status of track lubricators.