For Mallard , the 1948 Locomotive Exchange Trials were over .
Mallard returned to the Waterloo - Exeter line for a Locomotive Club of Great Britain ( LCGB ) railtour on 24 February 1963 .
For Mallard , the 1948 Locomotive Exchange Trials were over , but Mallard returned to the Waterloo - Exeter line for a Locomotive Club of Great Britain ( LCGB ) railtour on 24 February 1963 .