Of note is that 7741 was one of the units (7739/42 were the others) disbanded, before being put in service, to make up the 8VAB 8001. When 8001 was itself disbanded, some of the spare vehicles had been reused to replace accident-damaged stock, so only 7741/42 were able to be reformed. So 7739 is the only 4VEP not to turn a wheel in revenue earning service...