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foam bedrolls...[foamies??] of the better quality , from camping/outdoorsie stores work well...lots of material for your pennies?

Iain Rice went into some detail to cure the OP's very problem......one issue hilited was the tendency for modellers to encapsulate their trackage in ballast that sets as hard as concrete.

There is a Dutch firm who specialise in a 'flexible' type of glue for ballast...which allows movement and insulation.

Resin W is NOT the stuff to use.

In the bad old days of model railways, the late Ken Northwood [North Devonshire Railway]developed a system whereby the track was secured to a card base, shaped as per the ballast shoulder...[upside-down U]...with the ballast material stuck to the surface....the track was secured by pins, but not tightly, through the card, which had underneath a thick strip of foam rubber....ie it could 'float' up and down, but not move sideways.....the card was NOT secured to the baseboard, thus allowing the flotation to take place.

Also question the use of 'rock' ballast material?

Granulated cork offers a much more 'resilient' medium?

Rice also suggests, having secured the track itself to a sub-base......that sub-base might then be secured to the baseboard proper, with a thick foam rubber layer fixed between?

this might obviate the need for 'heavy' materials in theboards themselves?

Also, one could apply spray foam [urea-formaldehyde??? the stuff builders use, cna be bought at B&Q...I use it to 'fire-seal' my old car bulkheads??]..to the underside of the baseboards, between any framing..[avoiding wires, point motors, the cat, etc]] to have the same effect as motorcar soundproofing??

rubber wheels, anyone??
 

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'Resin W' is a liquid,''PVA'' type woodworking glue......sold in the yUK......not sure what it's called elsewhere...[oh,the internationalism of the tinternet??]

it sets up to an incredibly strong bond......use it to secure track/ballast, and nothing short of a modest quantity of blasting powder will allow any alterations.......guarenteed NOT to go down too well with any 'domestic' authorities?

yet, folk use it because ''it's there''....and looks similar to ordinary PVA..

best PVA glue to use for ballast...if that's the way you want to go....is the real cheapo stuff sold for school use,and for kids..........ou really need to aim for nothing more than the most tenuous of bonds.....simply to retain the ballast, ''in place''
 

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Sundeala, whilst once the recommended top surface for baseboards, can be quite finnicky when it comes to remaining level.

it needs very frequent bracing,in my experience........the US idea of a plywood sub-base,topped with ''sundeala'' for track pins is a well tried formula.....seeing as much US handlaid track required the use of spikes....therefore needed something that was easy to pin to.

the stuff was well advocated by Peco,I think...and was available in sheets as modeller's board.....I have several sheets still in their poly wrappers.......after more than 10 years....never got around to using them.....

sundeala will still resonate.....but the sound levels involved may well be acceptable to most??

I first started out using Peco's first recommendation.....wood fibre insulation board...anyone remember that stuff?

I found it useful since I used Peco's self build TT trackage...fibre sleeper strips, with FB rail spiked down like the US stuff....and wires soldered using an iron heated in an old ceramic gas fire.......probably using coal gas, as this would havebeen long before the discover of oil/gas in the North Sea....
 
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