Microsoft Train Simulator

Hi,

while i m playing the above game, i get the message as activity ended :
fuseable plugs melted. I don't know how to over come this error while driving
the steam trains like Flyins Scotsman and Goldsrof engine.

Please if any one knows how to control the train to over come this error I
will be very happy. I like this game but cannot play for a long. Pls help me
if u can give me some tips or some key commands I hv to take care while
driving such steam engines.

Thankx.
--
Athar Sagri