Mark 4 coaching stock is on lease with London North Eastern Railway and Transport for Wales Rail Services.
The coaches are purpose-designed for longer-distance services. Currently operating with the 125mph Class 91 electric locomotive and Mark 4 Driving Van Trailer, the Mark 4 coaches have operated in passenger service with other electric locomotives, including the 110mph Class 90.
The Mark 4’s physical and electrical interfaces also facilitate integration with a number of other diesel and bi-mode locomotives.
There are 302 vehicles in the Mark 4 fleet with 7 different passenger vehicle types.
The recent high-specification investment in the coaches has included an interior refresh and all modifications required to make the Mark 4 fleet TSI PRM compliant.