The British Rail Class 421 electrical multiple units were built at BR's Holgate Road carriage works between 1964 and 1972. Units were built in two batches, and were initially introduced on services on the Brighton Main Line. Later units were introduced on services to Portsmouth. The British Rail Class 319 is a dual-voltage electric multiple-unit passenger train capable of operating on 25 kV 50 Hz AC from overhead wires or 750 V DC from a third rail. They were built by British Rail Engineering Limited's Holgate Road carriage works for use on north-south cross-London services. The British Rail Class 455 is an electric multiple-unit passenger train built by BREL between 1982 and 1985. They are operated on suburban services in Greater London and Surrey by South Western Railway and Southern. The British Rail Class 73 is a British electro-diesel locomotive. The type is unusual in that it can operate from the Southern Region's 650/750 V DC third-rail or an on-board diesel engine to allow it to operate on non-electrified routes [freight services can be layered on by other routes, these locos include; the class 37, class 47 and class 40]
Please please please not another anachronism like DLoGW. Much of the BML has changed since even 2010, it'd be so far from appropriate.
sure it will be like diesel legends, but the fact we have old fashioned stuff like slam doors, class 73s, and the addition of a class 319 would be really nice