It all starts with a Frame . After all that track laying at your MES it is time to build something to run on the renovated rails I like the idea of a small Lister diesel . Small engines are avalable for a relatively cheap Price or a motorscooter /Moped power unit of any Kind is useable to Keep the cost low In 7.25 Inch the poxssibilities are limitless and please Keep us posted About your efforts
cheers Joe