N Scale Erie Trailing Truck Booster Engine Image of CAD Model by Keystone Details N Scale Lima designed trailing truck booster engine. This booster engine is designed for the Keystone Customs Lima trailing truck for the LifeLike Berkshire, but may be adapted to other trucks with some modeling skills. purchase on shapeways n scaleJohn LeMeriseJanuary 8, 2017rolling stock upgrade 0 Likes