need help in lubricating a BLI "A" class Loco

[NW Modeling List]

Mark; Remove the little cover at the top of the boiler and there is a small 
screw underneath (I know the rascal has a name but my steam loco 
nomenclature is not near what it should be). Then remove the two screws 
under the cab below the trailing truck and pop out the handrails on the rear 
of the cab. I think that should get the "boiler" off. Be careful when lubing 
the towers. the little plastic caps, particularly on the rear gear tower 
tend to pop off and allow the gears to disengage or not mesh properly. That 
may explain the noise you heard.  Dan Mulhearn, lost in the 60s but do 
occasionally run a "steam excursion" on the HO "Poky"