However , during 1960 THR completed four major steam to diesel conversions at Kilnhurst and seven in 1961 plus one new Vanguard loco , more than equating the lost Planet turnover .
The sale of Planet locos had averaged around eight locos per year .
During 1960 THR completed four major steam to diesel conversions at Kilnhurst and seven in 1961 plus one new Vanguard loco , more than equating the lost Planet turnover .
The sale of Planet locos had averaged around eight locos per year .