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I suggested the possibility of stretching a Schools to make a powered BL Atlantic. At the time the idea was vetoed as the collective expertise of the Gnatterboxers pointed out the Hornby Schools is a tender drive model so no good for an eight wheel bogie tender.
Light bulb latteral thinking moment today, which checking the Roche drawing for the Schools in 4mm proved was a possibility. As measured in this thread the Underground Ernie
chassis wheelbase at 24mm fits the axle spacing of a Schools tender as does the 44 tonner mech (NB which 44 tonner and which make?).
So the possibility arises of using parts from a Hornby Schools, plus two Dapol Schools kits and an Ernie/44T mech. Stretch the loco at the back end, adding a trailing truck and new cab, chop the Dapol tenders into two thirds/third and put back together as a cut and shut. Front two thirds of one and back two thirds of the other to make an eight wheeler with the side frames made into two pivotable four wheel bogies. One with an Ernie mech up it as a motor bogie. The Dapol tender option would alo fit the alternative BL pacific based on an Arthur sugegstion without the need for a power bogie as the Arthur is loco drive. The hard part of doing anything withe Dapol tenders would be rubbing them down afteer scraping off the raised mouldings where the lining should go.
The spare shools tender drive unit can then go under something else such as a freelance diesel.
I'm sure I have a couple of Airfix/Dapol Schools loco kits in my old 4mm/OO stock box so I think I have just set myself my modelling challenge for the winter, firstly as a static loco mock up and if that looks OK find a second-hand Schools and go for a powered version.