Bachmann Class 66 "Sence" 66711 £99.99 at Kernow Model Centre.
http://kernowmodelrail.secure-basket.com/p/54546/32-738-WSL-Bachmann-Class-66-Diesel-Locomotive-number-66-711
Bill.
Bachmann Class 66 32-733DS - £179 from JDM Models, only 1 in stock .
http://www.jdmmodels.co.uk/Bachmann?sort=p.model&order=ASC&page=8&product_id=1983
Bill.
Had the same problem with a couple of electrofrogs, where working fine when laid but after ballasting found two were dead. I soldered across the gap and they both work fine now.
Bill.