The Class 73 is a train operated by some of the biggest train operators in the UK such as Network Rail, GBRF & LSL. This would be the first British Electric Locomotive. It can also serve the newly added RHTT services, along with other forms of Test Trains.
When it comes to diesel mode Class 73 original is Blue Star Mu meaning you can combine that with the following locomotives Classes 40 & 45 Huddersfield Line 1983 Tees Valley Line 37/5 31 & 20 WSR Class 33 and West Cornwall local 37/5 all are Blue Star Code. Electric Mode MU Class 33/1 and Mk 1 EMUs SR MU system the 4 CEP 2 EPB 4VEP CIGs. Class 73/9 AAR Mu system meaning Class 73/9 can be slaved to Class 66.