BGLR : Technical issues

Last year during the heat wave there was some track buckling, as a precaution this year following hot spells Growler runs light engine before the BGLR has a running session to make sure the track is ok. Unfortunately while the track is ok Percy seems to have begun having the same motor (or PCB perhaps) issues that eventually killed Maria. As a precaution Percy has been taken out of service and Tango has taken it's place. The BGLR is now concerned there is a design flaw in the type of loco Maria and Percy belong to, Ruby (currently in reserve) also is of this type!